Grab a microwave-safe bowl and toss in the butter and chocolate chips. Heat them in 30-second bursts, stirring between each round. You're looking for smooth, glossy goodness here.

Crack the eggs into the melted chocolate mix, then add the sugar, vanilla, and salt. Whisk it all together until it’s silky smooth.

Now stir in the flour bit by bit. Don’t overmix—just gently fold it in until everything comes together.

Pour the batter into a greased mug or ramekin. Pop it in the microwave for about 45 seconds to a minute. It should look set on the edges but still gooey in the middle. Let it cool briefly.