Preheat oven to 350°F. Combine ... soda, and baking powder together. In a large mixing bowl, combine shortening, sugar, eggs, and vanilla. Stir ... 10 minutes before frosting. Beat all ingredients 5 minutes at high speed.
Put all ingredients except egg ... 25 minutes. Combine sugar, cornstarch and salt in ... minutes, or until frosting holds a peak. Remove from ... 1 (3 layer) cake.