Ingredients
- 1 cup (2 sticks) unsalted butter
- 2 1/4 cups granulated sugar
- 1 1/4 cup cocoa
- 1 teaspoon baking powder
- 1 teaspoon salt
- 1 teaspoon vanilla extract
- 4 large eggs
- 1 1/2 cup all purpose flour
- 2 cups chocolate chips
Melt chocolate chips and butter together over low heat in a double boiler. Combine all ingredients in a mixer. Pour into buttered 1/2 sheet pan & place in preheated 375°F oven for 25 minutes.