Make your cake:

Preheat your oven to 350º F. Grease and flour a 9x13" rectangular pan.

In a small bowl, sift together the cake flour, baking powder and salt. In a large bowl, cream the butter and sugar together until light and fluffy. Beat in the egg yolks one at a time, then stir in the vanilla. Beat in the flour mixture alternately with the milk on low, mixing just until incorporated. Scrape batter into prepared pan.

Bake in the preheated oven for 25 to 30 minutes, or until tops spring back when lightly tapped. Don't overbake! Cool 15 minutes before turning out onto cooling racks.

Make your frosting:

Combine cream cheese, sugar, and vanilla extract in the bowl of a mixer (or large bowl with handheld mixer) and beat until smooth. Slowly add in the heavy whipping cream and beat until whipped and fluffy--frosting will hold a stiff peak.

Assemble your cake:

Place your cooled cake on a serving board and slather in frosting, covering all edges and smoothing. Then create your flag design by making a square at the top left corner out of blueberries, pressing Bunny Grahams into the frosting to act as the stars on the American flag. Lay sliced strawberries in horizontal lines to mimic the stripes. Serve!