Black Cherry Cake Recipe

In a large bowl, combine the cake mix, water, egg whites and oil; beat on low speed for 30 seconds. Beat on medium for 2 minutes. Fold in one carton of yogurt. Pour into a 13-in. x 9-in. baking dish coated with cooking spray. Bake at 350° for 30-35 minutes or until a toothpick inserted near the center comes out clean. Cool on a wire rack. Place remaining yogurt in a small bowl; fold in whipped topping. Spread over cake. Store in the refrigerator. Yield: 15 servings.