For each additional layer, add half as many servings. So, if a 4-inch round cake with two layers makes 8 servings, a 4-inch ...

Butter an 8-inch round cake pan (2 inches deep) with the reserved 1/2 teaspoon butter. Pour the cake batter into the pan and bake for 45 minutes. Cool on a rack. At serving time, place the cake on a ...