1/2 cup cocoa
1 cup boiling water
1 & 1/4 cups cake flour
1 teaspoon baking soda
1/4 teaspoon salt
1/4 teaspoon baking powder
1/2 cup softened butter
1 & 1/4 cup sugar
2 eggs
3/4 teaspoon vanilla
Whisk cocoa and boiling water until smooth and set aside. Sift the cake flour with the baking soda, salt and baking powder. Set aside.
In a mixer bowl, cream butter and sugar until light and smooth. Add the eggs one at a time, mixing well after each addition. Add the vanilla. Add the cocoa mixture and flour mixture in alternating portions, starting and ending with the flour, as mixer is running.
Bake in two 8-inch round pans in a 350° oven for 30 to 35 minutes, or until done.
Source: Soft-As-Silk cake flour box