Momma Marilyn's Molten Chocolate Cakes

4 squares semi-sweet baking chocolate
1/2 cup butter
1 cup powdered sugar
2 eggs
2 egg yolks
6 Tbs. flour

Microwave butter and chocolate until smooth. Stir in sugar, then eggs and then flour. Butter ramekins and pour in batter. 
Bake at 425 for 13-14 minutes.