Line a 9x13 inch baking dish with parchment paper. In a bowl, mix graham cracker crumbs, melted butter, and granulated sugar. Press the mixture firmly into the bottom of the prepared dish. Place in the freezer for 10 minutes to set.

In a large bowl, beat the softened cream cheese and powdered sugar until smooth.

In a separate bowl, whip the cold heavy whipping cream and vanilla extract until stiff peaks form. Gently fold the whipped cream into the cream cheese mixture until fully combined.

Spread the creamy filling evenly over the chilled graham cracker crust.

Arrange the fresh blueberries in the top left corner to represent the stars. Layer the sliced strawberries in horizontal rows across the remaining surface to create the stripes.

Cover tightly and refrigerate for at least 4 hours, or overnight, until firm. Slice into bars before serving.