I haven't had a chance to make any of the cupcakes yet. But tomorrow is my husband's birthday, and I was hoping to use the basic chocolate cupcake recipe but make an actual cake from it rather than cupcakes. Has anyone done this? The cupcakes are supposed to cook for 18 to 20 minutes at 350 - so I'd guess 25 or so then in cake form? Does that sound right? Anything else I need to change?