Preheat oven to 375 and grease a 14" pizza pan and set aside.
In a mixing bowl, add sugar cookie mix, butter and egg and mix well. Press batter into prepared baking sheet. Bake for 12-18 minutes or until golden brown and center is set. Remove from oven and cool completely.
Add whipping cream to a mixing bowl and beat well until stiff. Add frosting and mix until combined well. Spread on top of cooled cookie.
Top with blueberries in a star shape and sliced strawberries, radiating from the berries. If desired add another layer of blueberries.
Slice to serve. Store any remaining cookie covered in the refrigerator.
Serves 8-12