01 - Set oven to 350°F and allow to fully preheat.
02 - Press sugar cookie dough evenly onto an ungreased 13x9 inch baking sheet or rectangular pizza pan, covering the entire bottom.
03 - Bake for 15 to 18 minutes, or until crust is lightly golden. Remove from oven and cool completely.
04 - In a medium mixing bowl, beat together cream cheese, unsalted butter, powdered sugar, and vanilla extract with an electric mixer until smooth and creamy.
05 - Spread the frosting evenly over the cooled cookie crust using a spatula.
06 - Arrange fresh blueberries in the top left corner to form the blue field of the flag.
07 - Alternate rows of sliced strawberries and banana slices across the remaining surface to mimic the red and white stripes.
08 - Refrigerate for at least 30 minutes before slicing and serving for optimal texture and appearance.