Preheat the oven to 450 F.

utter small ramekins or muffin pans. In a medium saucepan, combine the butter and the chocolate over medium heat.Heat, stirring occasionally to combine, until the chocolate and butter are melted.

In a medium bowl, whisk together the yolks and eggs, then add the sugar. Add the chocolate mixture and whisk until well combined.

hen whisk in the all purpose flour. Divide the butter among the ramekins.

Place the ramekins on a baking sheet and bake for about 5 to 7 minutes. The outside of the cake will be ready, but the inside should be very soft.