Preheat Oven: Preheat the oven to 375°F. Lightly grease a 12-inch pizza pan.
Form Crust: Slice the cookie dough into 1/4-inch rounds. Arrange them on the pizza pan and press into an even layer. Reserve one slice if you want to bake a small cookie star for decoration.
16.5 ounces refrigerated sugar cookie dough
Bake Crust: Bake for 11 to 12 minutes, until lightly golden brown. Let the crust cool completely. While it cools, wash and thoroughly dry the blueberries and raspberries.
Mix Filling: Beat the cream cheese, sugar, and vanilla until smooth. Beat in 4 ounces of the whipped topping, then gently fold in the remaining 4 ounces until fluffy.
8 ounces cream cheese, 2/3 cup granulated sugar, 1 teaspoon vanilla extract, 8 ounces whipped topping
Spread Filling: Spread a little less than half of the filling over the cooled crust, all the way to the edges.
Add Blueberries: Arrange the blueberries around the outer edge of the pizza and fill in the upper left section to create the blue field of the flag.
2 cups fresh blueberries
Add Raspberries: Arrange the raspberries in seven horizontal rows to make the red stripes.
3 cups fresh raspberries
Pipe White Stripes: Transfer the remaining filling to a piping bag or zip-top bag and pipe it between the raspberry rows to make the white stripes.
Chill and Serve: Refrigerate until ready to serve. Slice and serve cold.