Bake your cupcakes directly in the ice cream cones. Fill 24 flat-bottom cones two-thirds full with cake batter. Place the cones in a high-sided 9-by-13-inch baking pan and bake in two batches at 325° F for 30 minutes. Let cool, then frost with two 16-ounce cans of frosting. You can have your cake and eat its holder, too.