Step 1

Preheat oven to 325°F. In a medium saucepan, melt butter and chocolate over low heat, stirring often. Once melted, remove from heat.

Step 2

Stir in sugar, flour, vanilla extract and eggs.

Step 3

Pour batter into a greased 8-inch square baking dish.

Step 4

Bake 22 minutes (do not overbake). Serve warm with vanilla ice cream.