In a large bowl, combine crushed graham crackers, melted butter, and granulated sugar until the mixture resembles wet sand. Press this mixture into the bottom of a 9x13 inch pan.

In another bowl, beat the softened cream cheese, powdered sugar, and vanilla extract with an electric mixer until smooth and creamy, about 2-3 minutes.

In a clean mixing bowl, whip heavy cream until stiff peaks form, about 3-5 minutes. Gently fold the whipped cream into the cheesecake mixture.

Spread the cheesecake filling evenly over the prepared crust.

Arrange blueberries in the top left corner for the stars and lay sliced strawberries across the filling for the red stripes.

Cover and refrigerate for at least 4 hours, or until set.

Once set, remove from the refrigerator, cut into squares, and serve chilled.