Hi, Rosalie. Our Classic Birthday Cake makes a fantastic sheet cake. It works best in a 9" by 13" pan — if you only have a 9" by 11" pan, you might want to make 3 to 4 cupcakes with some of the batter to prevent it from overflowing in the oven. 9" by 13" is a very common pan size, so if you realize that you have this pan as an option, here are the adjustments you'll want to make: Prepare the batter as directed. Pour it into a lightly greased 9" x 13" pan, and bake in a preheated 325°F oven for about 45 to 48 minutes, until the cake tests done. You'll have excess frosting if you make the entire frosting recipe; if you don't want to end up with leftover frosting, consider making a half recipe (which will frost the cake minimally), or a three-quarter recipe (which will frost it more generously). Happy baking!

• Reply