When you're making a cake from a boxed mix, it makes sense to follow the directions on the back, but we have a different suggestion that's better and easier.

cup butter 2 cups sugar 4 squares bitter chocolate 2 egg yolks 1 teaspoon vanilla 2 ½ cups cake flour 2 teaspoons baking powder ½ teaspoon salt 1½ cups sweet milk 2 egg whites ...