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["Preheat the oven to 350 degrees F. Prepare 3 10"" round cake pans by spraying with nonstick cooking spray and lining each pan with waxed paper cut to fit.", "", "Using an electric mixer, beat the butter and 2 cups of sugar at high speed until lighter in color and fluffy.", "Sift the salt, flour, cornstarch, and baking powder together.", "", "Mix the milk and vanilla together.", "", "Add the dry ingredients and wet ingredients alternatively to the batter, ending with the dry ingredients.", "", "In a separate bowl, beat the egg whites until foamy.", "", "Add the cream of tartar and beat until soft peaks form.", "", "Slowly add the remaining 1/2 cup sugar to the egg whites, and beat until stiff peaks form.", "", "Using a rubber spatula, gently fold a little of the egg whites into the batter, then the remaining whites, until just combined. Do not overmix the batter or you'll lose all the air you worked so hard to incorporate, and the texture of the cake will change.", "", "Pour 1/3 of the batter into one cake pan and the remaining 2/3 into the other two pans. Bake for 25-35 minutes. (Check after 25). Cake is done when a tester inserted into the center of the cake comes out clean.", "", "Cool the cakes in their pans for about 15 minutes, then turn out onto a wire rack to cool completely."]
