Preheat your oven to 425°F (220°C). Grease four ramekins with butter and lightly dust with flour, tapping out any excess.

In a microwave-safe bowl, combine the semi-sweet chocolate chips and unsalted butter. Heat in the microwave in 30-second intervals, stirring in between, until completely melted and smooth.

In a separate mixing bowl, whisk together the powdered sugar, eggs, and egg yolks until well combined and slightly frothy.

Slowly pour the melted chocolate mixture into the egg mixture, stirring constantly. Add the vanilla extract and a pinch of salt.

Gently fold in the all-purpose flour until just combined. Be careful not to overmix.

Divide the batter evenly among the prepared ramekins, filling each about 2/3 full.

Place the ramekins on a baking sheet and bake for 12-14 minutes. The edges should look firm while the center remains slightly soft.

Remove from the oven and let them sit for a minute. Carefully invert onto plates, serve with your favorite toppings like ice cream or fresh berries, and enjoy!