Chocolate Angel Food Cake - cooking recipe

Ingredients

1 1/3 c. cake flour
1/2 c. cocoa powder
1 tsp. baking powder
12 egg whites
1 3/4 c. confectioners sugar, sifted
1 tsp. cream of tartar
2 Tbsp. unsalted butter, melted and cooled
2 tsp. vanilla extract

Preparation

Preheat oven to 325\u00b0.
Combine the flour, cocoa and baking powder; sift twice.
Set aside.