How to Make an Ice Cream Flag Cake

Preheat the oven to 325 degrees F; coat a 9-inch-round springform pan with cooking spray. Prepare the cake mix as directed, adding the cocoa powder and food coloring to the batter. Transfer to the prepared pan and bake until done, about 45 minutes.

Let the cake cool, then remove from the pan; level the domed top with a serrated knife. Use a 5-inch circle of parchment paper as a guide to cut a circle from the center of the cake (you won't need the small circle). Freeze the large cake ring.

Cut a 6-by-30-inch strip of parchment paper. Clean the springform pan, then butter it and line the side with the parchment as shown; the paper will extend above the rim of the pan so you can build a tall cake.