Why You Need to Try a Knock Knock Cake
I still remember the first time I saw someone knock on a cake. My friend’s daughter turned to her birthday cake, gave it three solid knocks, and the front panel fell away to reveal a cascade of colorful candies and chocolates spilling out onto the table. The kids went absolutely wild. I thought to myself, “Where has this been all my life?”
That was my introduction to the knock knock cake, and I’ve been hooked ever since. This creative dessert has taken Malaysia by storm, becoming the go-to choice for birthdays, celebrations, and anyone who wants to add a bit of magic to their party. Unlike those same old cakes we’ve all seen a million times, a knock knock cake brings genuine surprise and joy to every celebration.
The beauty of this dessert is that it works for any occasion. I’ve seen simple designs for kids’ parties and elegant versions for adult celebrations. In Penang and KL, bakeries have started offering incredible variations, from sports-themed designs to princess castles and even corporate logos. The options are truly endless, and each one brings its own special touch to the party.
What Exactly is a Knock Knock Cake?
A knock knock cake is basically a hollow cake with a removable front panel. When you knock on it (usually three times, just like the classic joke), the panel falls away to reveal hidden treats inside. Think of it as a cousin to the pinata cake, but with its own Malaysian twist.
The cake itself is built like a box rather than a traditional round or square cake. It has four walls and a top, with one wall designed to pop out easily when tapped. The hollow center gets filled with anything you can imagine: chocolates, candy, small toys, money, or even personalized notes. I once filled one with lottery tickets for my dad’s retirement party. He loved it.
This interactive element is what makes knock knock cakes so special. Regular cakes just sit there looking pretty until you cut them. But a knock knock cake becomes part of the entertainment. Everyone gathers around, the birthday person gives it a knock, and boom – instant celebration moment. Kids love the surprise, and honestly, adults get just as excited.
The concept likely evolved from traditional pinata cakes, which have been popular in various forms around the world. But the knock knock cake Malaysia style has its own identity. Malaysian bakers have perfected the structure and added local flair with unique designs and decorations.
What sets it apart from a regular cake? The construction is completely different. Instead of layers stacked on top of each other, you’re building walls and creating a cavity. The front panel needs to be secure enough to stay in place during transport but loose enough to fall away with a gentle knock. It’s engineering meets baking, which I find pretty cool.
How to Make a Knock Knock Cake
Making a knock knock cake at home is easier than you might think. I was nervous my first time, but once you understand the basic structure, it becomes straightforward. Let me walk you through the process I use every time.
What You’ll Need:
- Your favorite cake recipe (I prefer vanilla or chocolate for versatility)
- Buttercream or fondant for decorating
- Cardboard or foam board for structure
- Parchment paper
- Candy, chocolates, or small toys for filling
- Sharp knife or cake leveler
- Piping bags and tips
- Food coloring (optional)
Step-by-Step Instructions:
1. Bake Your Cake Layers
Start by baking rectangular cakes in 9×13 inch pans. You’ll need at least two cakes, maybe three depending on how tall you want your creation. Let them cool completely before working with them. I usually bake mine the night before to make sure they’re totally cool.
2. Build Your Box Frame
Cut cardboard or foam board to create a box template. You need five pieces: a base, two side walls, a back wall, and a top. The front stays open for now. Make sure your measurements match the size you want for your final cake. I typically make mine about 8 inches tall, 10 inches wide, and 6 inches deep.
3. Cut and Attach Cake Pieces
Cut your cooled cakes to match your cardboard template. You’ll need pieces for each wall and the top. Use buttercream as glue to attach cake pieces to the cardboard frame. This is messier than it sounds, so don’t worry about perfection at this stage. The frosting will cover everything.
4. Create the Knock Panel
Here’s the tricky part. Cut a rectangular piece of cake for your front panel. Don’t attach it yet. Instead, create small support points using toothpicks or wooden skewers positioned at the top corners. The panel should rest against these but remain loose enough to fall with a knock.
5. Frost the Entire Structure
Apply a crumb coat of buttercream to seal in crumbs. Chill for 30 minutes. Then add your final coat of frosting. I prefer working with buttercream because it’s more forgiving than fondant, especially for beginners. You can smooth it out or create textured designs.
6. Decorate Your Design
This is where your knock knock cake design really comes to life. Use piping, fondant decorations, edible prints, or whatever matches your theme. I’ve done everything from simple rosettes to elaborate superhero scenes. Check online for knock knock cake ideas if you need inspiration.
7. Fill and Seal
Carefully place your chosen fillings inside the hollow center. Don’t overfill, or the panel won’t close properly. Gently position the front panel against the support points. Add a few decorative elements to disguise the seam where the panel meets the rest of the cake.
My Top Tips for Success:
- Keep your cake chilled while decorating. It’s much easier to work with cold cake.
- Test the knock panel before decorating the front. Make sure it falls easily but doesn’t collapse on its own.
- Use lighter fillings. Heavy items can make the panel fall prematurely.
- Transport carefully. The panel can shift during movement, so drive slowly if you’re taking it somewhere.
- Consider the knock knock cake price at bakeries before deciding to DIY. Sometimes the time savings are worth paying a professional.
If you’re in Penang or KL, many bakeries now offer custom knock knock cakes. You can usually find them starting around RM150, depending on size and design complexity. For your first attempt, I’d suggest trying a simple knock knock cake recipe at home before investing in an elaborate custom order.
The learning curve isn’t steep. My first attempt looked a bit wonky, but everyone still loved it. By my third try, I was creating designs that looked bakery-quality. The joy on people’s faces when that panel falls away makes every bit of effort worthwhile. Trust me on this one.
Popular Knock Knock Cake Recipes and Variations
Once you’ve mastered the basic technique, you’ll probably want to experiment with different flavors and styles. I know I did. My kitchen turned into a testing ground for all sorts of combinations, and honestly, some worked better than others.
The classic vanilla knock knock cake remains my go-to for most celebrations. I make a simple butter cake using the creaming method – it holds its structure well and doesn’t crumble when you’re cutting those precise shapes. For chocolate lovers, a dense chocolate fudge recipe works beautifully. Just remember that darker cakes can show crumbs more easily through light-colored frosting, so take extra care with your crumb coat.
Here’s something interesting I discovered: cakes using condensed milk create an incredibly moist texture that stays fresh longer. This matters more than you’d think with knock knock cakes since you’re building them a day or two before serving. I tried a condensed milk sponge cake for my niece’s birthday last month, and the cake was still perfectly moist three days later.
Now, let’s talk about the pinata cake – it’s the cousin I mentioned earlier. What exactly is a bomb cake, you might wonder? Well, bomb cakes and pinata cakes are essentially the same concept with different names. The main difference between these and a knock knock cake Malaysia style is the reveal method. Pinata cakes get smashed open with a mallet or hammer, while knock knock cakes use that gentler tapping mechanism. Both are filled with surprises, but the knock knock version feels less destructive, which some parents appreciate when they’re dealing with younger kids wielding hammers.
I’ve made both types, and each has its place. The pinata cake works great for outdoor parties where mess doesn’t matter much. But for indoor celebrations or formal events, the controlled knock reveal wins every time. Nobody wants chocolate candies rolling under the furniture at a restaurant venue, trust me on that one.
One variation I absolutely love is the strawberry whipped cream cake style knock knock cake. I make the walls from vanilla sponge layers, then fill the cavity with fresh strawberries and small chocolates. The outside gets decorated with whipped cream frosting – lighter than buttercream but still sturdy enough for the structure. It’s perfect for summer celebrations and feels less heavy than traditional frosted versions.
For sports-themed parties, I’ve created everything from basketball courts to soccer ball cake designs. The rectangular shape of knock knock cakes actually lends itself well to creating stadium or field themes. You can pipe grass patterns, add fondant players, or create team logos. One dad asked me to make a Manchester United themed knock knock cake filled with small football cards for his son’s tenth birthday. The kid nearly cried from excitement.
Creative Knock Knock Cake Design Ideas
The design possibilities genuinely blow my mind sometimes. I’ve seen knock knock cakes that look like treasure chests, wrapped presents, school lockers, safes, and even miniature houses. Each design tells a story and sets the tone for the entire celebration.
For kids’ parties, character themes dominate. Think unicorns, dinosaurs, superheroes, and princesses. I made a Frozen-themed knock knock cake last winter where the front panel looked like ice that “shattered” when knocked. Inside? Blue and white candies that looked like ice crystals, plus small Elsa figurines. The birthday girl absolutely lost her mind.
But here’s where it gets really interesting – adult celebrations. Corporate events have started incorporating knock knock cakes with company colors and logos. Retirement parties feature cakes filled with money or gift cards. I attended a wedding last year where the couple had a knock knock cake filled with handwritten advice cards from guests. When they knocked it open during the reception, reading those notes became an interactive part of the evening.
Gender reveals have become another popular use. Imagine a neutral-colored knock knock cake filled with either pink or blue candies. The parents-to-be knock it together, and boom – everyone finds out at the same time. It’s more dramatic than cutting into a colored layer cake, and the photos capture genuine surprise reactions.
Funny enough, I’ve started incorporating healthier options for some clients. Not everyone wants their kids hopped up on pure sugar. I’ve filled knock knock cakes with dried fruit, nuts, small toys, stickers, temporary tattoos, and even pencils for back-to-school celebrations. One health-conscious mom requested I fill hers with angel food cake calories-friendly mini protein bars and dark chocolate squares. It worked surprisingly well.
The texture combinations matter too. Some bakers create smooth fondant finishes for elegant looks, while others embrace rustic buttercream textures. I’ve experimented with ombre effects, watercolor painting techniques on fondant, and even edible image printing. Digital prints let you put literally any image on your cake – family photos, cartoon characters, or abstract designs.
Seasonal themes offer endless inspiration. Halloween knock knock cakes shaped like haunted houses filled with candy corn. Christmas versions designed as wrapped presents containing ornaments and chocolates. Valentine’s Day hearts bursting with conversation hearts and love notes. Easter eggs filled with jelly beans. The calendar gives you built-in knock knock cake ideas throughout the year.
What makes a design truly memorable? Personal touches. I always ask clients about the recipient’s hobbies, favorite colors, and interests. A bookworm might love a knock knock cake designed like a stack of books. A musician could receive one shaped like a piano or guitar. Gamers go crazy for console-themed designs filled with gaming accessories or gift cards.
Knock Knock Cake Prices and Where to Find Them
Let’s talk money because that matters when you’re planning a celebration. The knock knock cake price varies wildly depending on where you are and what you’re ordering.
In Penang, I’ve seen prices starting around RM120 for basic designs and going up to RM400 or more for elaborate custom creations. The simpler rectangular designs with basic decorations typically fall in that RM120-RM180 range. Once you add custom fondant work, edible prints, or intricate piping, you’re looking at RM250 and up. Premium fillings like imported chocolates or branded toys can push prices even higher.
Over in KL, the market’s a bit more competitive, which sometimes works in your favor. I’ve found knock knock cake kl options starting as low as RM100 for simple 8-inch designs. But the average seems to hover around RM150-RM200 for a decent quality cake that serves about 15-20 people. Upscale bakeries in places like Bangsar or Mont Kiara charge RM300-RM500, though you’re definitely paying for premium ingredients and professional execution.
By the way, timing affects pricing too. Order during peak seasons like December holidays or school break periods, and you’ll pay more. Some bakeries add rush fees if you need something in less than a week. I’ve learned to plan ahead – booking two to three weeks in advance usually gets you better rates and more design flexibility.
Online ordering has changed the game completely. Several Malaysian bakers now ship knock knock cakes nationwide, though you’ll need to factor in delivery costs. Instagram and Facebook have become hunting grounds for talented home bakers who often charge less than established bakeries. I’ve found amazing knock knock cake penang creators on Instagram offering custom designs for RM130-RM180 with fillings included.
Here’s the thing about deals and promotions – they exist if you know where to look. Many bakeries offer package deals during slower months like January or February. Some run promotions where you get discounted prices for ordering multiple cakes at once. Birthday clubs and loyalty programs can save you 10-20% on subsequent orders.
Group buying platforms occasionally feature knock knock cakes at reduced rates. I snagged a deal on one platform last year – RM99 for a basic design that normally cost RM150. The catch? Limited customization options and fixed pickup dates. But for budget-conscious celebrations, these deals work perfectly fine.
When comparing prices, consider what’s included. Some quotes include fillings and candles, while others charge extra for everything beyond the basic cake structure. Ask about serving sizes too. A cake advertised as serving 20 might be cut into tiny slivers, while another bakery’s portions are more generous.
Making your own obviously costs less in terms of money but requires time investment. I spend about RM40-RM60 on ingredients for a homemade knock knock cake, plus another RM20-RM30 on fillings and decorations. That’s roughly half what I’d pay a bakery, but it takes me 4-5 hours from start to finish. You decide if that trade-off makes sense for your situation.
For those in smaller towns outside Penang or KL, availability might be limited. Check with local bakeries about custom orders – many are willing to try new things if you bring them reference photos. Otherwise, the DIY route becomes more appealing when professional options aren’t nearby. The knock knock cake community online is incredibly supportive, with bakers sharing tips and troubleshooting advice freely.
FAQs About Knock Knock Cakes
I get tons of questions about knock knock cakes whenever I post pictures on social media. People are curious about how they compare to other trendy desserts, where the idea came from, and whether they’re worth the hype. Let me clear up some of the most common confusion I’ve encountered.
What exactly is a bento cake?
Here’s something that trips people up all the time. A bento cake is completely different from a knock knock cake, though both are trendy right now. Bento cakes are tiny individual cakes, usually about four inches across. They’re called bento cakes because they’re small enough to fit in those Japanese bento lunch boxes. Think of them as personal-sized desserts designed for one or two people max.
I made my first bento cake for my sister’s solo birthday celebration during lockdown. It was just big enough for her to enjoy without waste. The appeal lies in minimalism and personalization – you get a whole decorated cake just for yourself with custom messages or designs. They’re typically not hollow and don’t have any surprise elements.
Knock knock cakes, on the other hand, are much larger and built specifically around that surprise reveal moment. They’re meant for groups and celebrations where interaction matters. The construction is totally different too. While bento cakes are just miniature versions of regular layered cakes, knock knock cakes require that hollow box structure. Both have their place in modern baking, but they serve different purposes entirely.
Is surprise cake from Shark Tank still in business?
You know what’s funny? So many people ask me if I got my knock knock cake idea from that Shark Tank product. The Surprise Cake company appeared on Shark Tank back in 2014, pitching their version of reveal cakes with hidden compartments. From what I’ve researched, the company did get some traction after the show but eventually faded from the mainstream market.
The concept they presented was similar – cakes with surprise elements inside. However, their business model focused on mass-producing specific designs rather than custom orders. The knock knock cake trend in Malaysia developed somewhat independently, influenced more by pinata cakes and local baker creativity than by any American product.
That said, the general idea of surprise cakes has exploded globally. Whether someone’s making a Shark Tank-inspired version or a Malaysian knock knock style, the core appeal remains the same. People love interactive desserts that create memorable moments.
Which is the most delicious cake in the world?
Okay, this is totally subjective and probably impossible to answer definitively. But I’ll share what I’ve learned from years of baking and eating cakes. Some people swear by classic French opera cake with its layers of coffee-soaked sponge and chocolate ganache. Others insist nothing beats a perfectly moist German chocolate cake or Italian tiramisu.
For me personally? A well-executed knock knock cake using quality ingredients can absolutely compete with any famous cake variety. I’ve made vanilla knock knock cakes with Madagascar vanilla bean that rivaled anything from fancy bakeries. The key isn’t the structure or concept – it’s the quality of your ingredients and execution.
The beauty of knock knock cakes is you’re not limited to one flavor profile. You can create them using recipes for any of the world’s most beloved cakes. Want a red velvet knock knock cake? Done. Black forest? Absolutely. Tres leches? I’ve even figured that out, though it’s tricky with the structural requirements.
What makes a cake “the most delicious” often comes down to context and memory. The knock knock cake I made for my mom’s 60th birthday will forever be her favorite, not because it was objectively the best cake ever created, but because of the moment it represented. Food is emotional like that.
What exactly is a bomb cake?
I touched on this earlier, but let me give you the full picture. Bomb cakes and pinata cakes are basically the same thing with different names depending on where you are. The term “bomb cake” became popular because of how dramatically they explode open when smashed.
The main difference between bomb cakes and knock knock cakes comes down to destruction method. Bomb cakes are designed to be hit hard – usually with a small hammer or mallet. You’re literally breaking through the cake wall to release the treasures inside. It’s more aggressive, louder, and messier. Kids absolutely love this approach because they get to smash something with permission.
By the way, I learned this the hard way at my nephew’s fifth birthday. We had a superhero bomb cake, and he went at it with such enthusiasm that candies flew everywhere. We found M&Ms under the couch for weeks afterward. That’s when I started appreciating the more controlled reveal of knock knock cakes for indoor venues.
Structurally, bomb cakes need to be built sturdier since they need to withstand transport and handling but still break apart when struck. The walls are often thicker than knock knock cake panels. Some bakers reinforce them with chocolate shells or hardened candy layers that shatter dramatically.
Here’s the thing – both styles work great depending on your party vibe. Outdoor celebrations, kid-heavy events, and casual backyard parties? Bomb cakes bring that wild energy. Formal venues, adult celebrations, or anywhere mess control matters? Knock knock cakes win every time.
Making Your Knock Knock Cake Experience Special
Beyond just following a knock knock cake recipe, think about the whole experience you’re creating. I’ve found that the anticipation builds the moment guests see the cake. They start wondering what’s inside, speculating about the reveal. That curiosity adds a layer of excitement regular cakes just can’t match.
One trick I love is adding sound effects. I know it sounds silly, but when my friend knocked her cake and we all counted “One, two, three!” before the panel fell, it created this shared moment everyone remembered. Some people play dramatic music. Others narrate like sports commentators. These little additions transform cake cutting from routine to ritual.
Photography matters more than you’d think. The knock moment happens fast, so make sure someone’s ready with a camera. I always designate a specific person to capture that exact second when the panel falls and surprises spill out. Those photos become treasured memories. I’ve seen them used in scrapbooks, year-in-review slideshows, and even thank-you cards.
Speaking of healthier considerations, while knock knock cakes are obviously treats, you can make thoughtful choices about ingredients. Using less refined sugars, incorporating whole grain flours, or choosing dark chocolate over milk chocolate creates a dessert that’s still indulgent but slightly more balanced. If you’re concerned about blood sugar balance, you might consider portioning the cake into smaller servings or balancing it with protein-rich party foods so guests aren’t just loading up on pure sugar.
The filling selection deserves careful thought too. I once made a knock knock cake for a child with nut allergies, so we filled it with nut-free candies and small bouncy balls instead. Being mindful of dietary restrictions and preferences shows you care about all your guests, not just the spectacle.
Presentation extends beyond the cake itself. I’ve seen people create whole reveal ceremonies. The birthday person wears special gloves. Guests gather in a circle. Someone reads a poem or shares memories before the knock. These rituals make the moment feel significant rather than just another party activity.
If you’re exploring more creative cake ideas beyond knock knock styles, I’d definitely recommend checking out other cakes and cupcakes recipes that can inspire your next baking adventure – there’s something magical about discovering new ways to surprise and delight people through desserts.
Transportation is another aspect worth mentioning. I’ve developed a system using cake boxes with extra support walls. The knock panel stays secure during travel, but I always test it before leaving home. Nothing’s worse than arriving at a venue and discovering your panel fell off in the car. Bring emergency repair supplies – extra frosting, toothpicks, and decorations – just in case.
Whether you decide to tackle a knock knock cake penang baker or attempt how to make knock knock cake yourself, remember that perfection isn’t the goal. I’ve made wonky cakes that leaned slightly, panels that didn’t fall on the first knock, and designs that looked nothing like my Pinterest inspiration. Every single time, people still loved them because the joy comes from the experience, not flawless execution.
The knock knock cake trend shows no signs of slowing down. I’ve watched it evolve from simple rectangular boxes to elaborate architectural creations. The knock knock cake design possibilities keep expanding as creative bakers push boundaries. Who knows what innovations we’ll see next year? Maybe cakes with multiple compartments, or motion-activated reveals, or designs incorporating lights and sounds. The future of interactive desserts looks pretty exciting from where I’m standing.
Start simple if you’re new to this. Don’t try creating a five-tier castle for your first attempt. Make a basic box, fill it with favorite candies, frost it in one or two colors, and nail the mechanics. Once you’ve got the structure down, then experiment with complex knock knock cake ideas and elaborate decorations. That’s how I learned, and it saved me from a lot of frustration.
Give yourself permission to have fun with this. Baking should bring joy, not stress. If your knock knock cake doesn’t turn out magazine-perfect, so what? The person celebrating their special day will appreciate the effort and love you put into creating something unique just for them. That matters infinitely more than sharp fondant edges or perfectly symmetrical piping.
So whether you’re planning to order a professional knock knock cake or roll up your sleeves and create one yourself, embrace the adventure. These interactive desserts have brought so much happiness into my celebrations, and I genuinely believe they can do the same for yours. The surprised faces, the excited squeals, the candies tumbling out – these moments become the stories families tell for years afterward. And isn’t that what celebrations are really about?
Frequently Asked Questions
How far in advance can I make a knock knock cake?
You can make the cake structure 2-3 days before your event if you store it properly in the refrigerator. I usually bake and build the frame two days out, decorate it the day before, and add fillings the morning of the event. This prevents the panel from getting too soft or the structure from absorbing moisture. If you’re using whipped cream frosting, stick to making it just one day ahead. Buttercream and fondant designs hold up better over multiple days.
What’s the best filling for a knock knock cake?
Lightweight candies work best because they don’t weigh down the knock panel. M&Ms, Skittles, small chocolates, marshmallows, and gummy candies are all excellent choices. I’ve also had success with small toys, confetti, rolled-up money, and personalized notes. Avoid anything too heavy like full-size candy bars or dense items that might make the panel collapse prematurely. Mix different textures and colors for visual impact when everything spills out.
Can I make a knock knock cake without special equipment?
Absolutely! You don’t need fancy tools to create a basic knock knock cake. I’ve made them using regular rectangular cake pans, cardboard from shipping boxes, and simple buttercream frosting. The essential items are just cake, frosting, something for structure support, and basic decorating tools like spatulas and piping bags. You can find piping tips at any grocery store. The technique matters more than expensive equipment, so don’t let a lack of professional tools stop you from trying.
How do I transport a knock knock cake safely?
Use a sturdy cake box with the same dimensions as your cake base. Place non-slip matting underneath the cake board to prevent sliding. Drive slowly and avoid sudden stops or sharp turns. I keep my cakes on the floor behind the front seat rather than in the trunk where they might shift more. If traveling more than 30 minutes, consider bringing repair supplies like extra frosting and decorations. Some bakers even transport the knock panel separately and attach it upon arrival for maximum security.
What size should I make my knock knock cake?
This depends on your guest count and how you plan to serve it. An 8×10 inch knock knock cake typically serves 15-20 people with modest slices. Remember that part of your cake is hollow, so you’re working with less actual cake than a solid version of the same size. For larger parties, either make a bigger structure or supplement with additional regular cakes. I usually calculate servings based on the wall thickness and total cake volume, not the outer dimensions.
Can I make a knock knock cake with dietary restrictions in mind?
Yes! I’ve successfully made gluten-free, dairy-free, and vegan knock knock cakes. The structure works with any cake recipe that’s firm enough to hold its shape. Gluten-free cakes sometimes need extra stabilization, so I add xanthan gum or use recipes specifically designed for structural integrity. For vegan versions, aquafaba buttercream works beautifully. Just make sure your fillings also match the dietary requirements – check candy labels carefully because many contain dairy or gelatin.
Why does my knock panel keep falling off before the event?
This usually means your support system is too weak or your panel is too heavy. Make sure you’re using sturdy toothpicks or wooden skewers positioned correctly at the top corners. The panel should rest against these supports but not be attached firmly. Check that your filling isn’t too heavy – remove some items if needed. Also, ensure your frosting hasn’t softened too much in warm conditions. Keeping the cake chilled helps maintain structure until showtime.
How much does it cost to make a knock knock cake at home?
My homemade versions typically cost RM40-RM80 depending on decoration complexity and filling choices. Basic cake ingredients run about RM20-RM30, frosting supplies another RM15-RM20, and fillings vary from RM20 for simple candies to RM40 for premium chocolates or toys. Add another RM10-RM15 for decorating supplies like food coloring, sprinkles, or fondant. This is roughly half what bakeries charge, though you’re investing 4-5 hours of your time. Factor in that time commitment when deciding between DIY and ordering professionally.
Can I freeze a knock knock cake?
You can freeze the unfrosted cake components for up to three months, which is helpful for advance preparation. However, I don’t recommend freezing a fully assembled and decorated knock knock cake because the moisture from thawing can compromise the structure and make decorations weep or slide. If you want to work ahead, freeze your baked cake layers, then thaw and assemble them 2-3 days before your event. This gives you the convenience of advance prep without the structural risks of freezing the complete cake.
What happens if the panel doesn’t fall when knocked?
Don’t panic – this happens sometimes! Give it a harder knock or carefully pull the panel away manually. I’ve learned to test the knock mechanism before decorating the front panel, which prevents this issue. If it happens at your event, just laugh it off and help it along. Guests care more about the surprise inside than perfect mechanics. For future attempts, make sure your support points aren’t too secure and that the panel isn’t stuck to surrounding frosting. A tiny gap around the edges helps it release cleanly.
The magic of a knock knock cake isn’t just in the surprise reveal or the cascade of treats – it’s in the shared joy and anticipation you create for people you care about. Trust yourself to try something new, embrace the imperfections, and watch how a simple knock can turn an ordinary celebration into an unforgettable memory.

Equipment
- Cake Pans
- Sharp Knife or Cake Leveler
- Piping Bags and Tips
- Cardboard or Foam Board
- Parchment Paper
Ingredients
- 4 eggs
- 200 g sugar
- 40 g cocoa powder
- 80 g all-purpose flour
- 5 g baking powder
- 1 g salt
- 300 ml heavy cream
- 150 ml caramel sauce
- 100 g chocolate chips
- q.s. powdered sugar for dusting
- q.s. cocoa powder for dusting
- q.s. caramel sauce for decoration
Instructions
- Preheat your oven to 175°C. Grease a 9x13 inch cake pan and line it with parchment paper.
- In a large bowl, beat the eggs and sugar until thick and pale. Sift in the cocoa powder, flour, baking powder, and salt. Gently fold until you have a smooth batter.
- Pour the batter into the prepared pan and spread it evenly. Bake in the oven for 12-15 minutes, or until the cake springs back when touched.
- While the cake is baking, heat the heavy cream in a saucepan until it simmers. Add the caramel sauce and chocolate chips until smooth.
- Once the cake is baked, flip it onto a clean kitchen towel dusted with powdered sugar. Carefully remove the parchment paper and roll it up with the towel inside. Allow to cool completely.
- Unroll the cake and spread the caramel-chocolate filling evenly across. Roll the cake back up without the towel.
- Dust the top of the roll with powdered sugar and cocoa powder. Drizzle with caramel sauce.
- Chill the roll for at least 1 hour before slicing and serving.