Lottie Lane Cake
["1 c. butter", "1 tsp. vanilla", "2 1/2 tsp. baking powder", "1 c. milk", "1 c. sugar", "2 1/4 c. sifted cake flour", "3/4 tsp. salt", "8 egg whites, beaten stiff"]
["Mix all ingredients and bake at 375\u00b0."]
["butter", "vanilla", "baking powder", "milk", "sugar", "cake flour", "salt", "egg whites"]