White Cake
["2 c. sifted flour", "2 1/2 tsp. baking powder", "3/4 tsp. salt", "1 c. sugar", "1/2 c. shortening", "3/4 c. milk", "3 egg whites", "1 tsp. vanilla"]
["Sift flour, baking powder and salt together three times. Cream sugar and shortening; add milk, stiffly beaten egg whites and vanilla. Bake at 350\u00b0 for 25 to 30 minutes.", "Frost with your favorite frosting."]
["flour", "baking powder", "salt", "sugar", "shortening", "milk", "egg whites", "vanilla"]