1 pkg. white cake mix
3/4 c. water
1/3 c. vegetable oil
3 egg whites
2 (6 oz.) containers strawberry yogurt
1 container frozen whipped topping
Red food color (if desired)

Heat oven to 350 degrees. Grease and flour 13 x 9 x 2 inch rectangular pan. Beat cake mix, water, oil, egg whites, and 1 container yogurt in large bowl, on low speed, for 30 seconds. Beat on medium speed for 2 minutes. Pour into pan. Bake 35 to 40 minutes or until cake springs back when touched lightly in the center. Cool completely. Thaw whipped topping. Fold yogurt and 1 to 2 drops food coloring into whipped topping. Spread over top of cake. Garnish with strawberries.