Adding sour cream to a yellow cake adds richness. Cooks can add it to a cake mix alternately with its dry ingredients. The cake recipe from About.com features 1 cup sour cream, 2 1/4 cups flour, 2 teaspoons baking powder, 1/2 teaspoon salt and 2 sticks sweet butter.
This recipe also calls for 4 large eggs and 2 teaspoons vanilla. To bake this cake, preheat the oven to 350 degrees Fahrenheit. Butter one or two pans and pour the mixture into them using a rubber spatula. For one large cake, bake for 60 minutes, and for two smaller cakes, bake for 45 minutes or until brown on the top.