Preheat the oven to 350°F (175°C).

In a large bowl, cream together the softened butter and granulated sugar until light and fluffy.

Beat in the egg and vanilla extract until well combined.

In another bowl, whisk together the flour, baking powder, and salt.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Spread the dough evenly onto a greased pizza pan or baking sheet to form a cookie crust.

Bake for 12-15 minutes or until the edges are lightly golden. Allow to cool completely.

In a medium bowl, beat the softened cream cheese, powdered sugar, and vanilla extract until smooth and creamy.

Spread the cream cheese mixture evenly over the cooled cookie crust.

Arrange the sliced strawberries and blueberries in the shape of a flag on top of the cream cheese layer, using banana slices and kiwi to create stripes and stars.

Chill in the refrigerator for at least 30 minutes before slicing and serving.