CAKE
1 1/2 cups sifted flour
1 1/3 cups sugar
1 tablespoon baking powder
1 teaspoon salt
1/2 teaspoon cinnamon
1 cup sour cream
1/2 cup butter shortening
3 beaten egg whites

ICING
1/4 cup butter
2 cups sugar
2 tablespoons evaporated milk
2 tablespoons hot water