Heat oven to 375. Spray a pizza pan or lg baking sheet w/ cooking spray. In bowl, stir together the cookie mix, butter and egg until a soft dough forms. Press dough into pan. Bake until light golden brown, 10-15 mins. Let cool completely.
In another bowl, beat cool whip and frosting. Spread frosting over cookie pizza dough. Arrange fruit on top of frosting. Cut into slices and serve.