This recipe will frost a 13×9 cake, a regular 9-inch cake, or around 24 cupcakes with a flat-spread of frosting. If you’re looking to pipe the frosting onto cupcakes, I would recommend doubling this recipe as you’ll use a lot more compared to a flat spread. For a 2-tiered 9-inch cake, you will want to make a double batch. You may have a bit more than you will need, but it never hurts to have a little extra just in case.