To make pizza, and macaroni and cheese casserole, and pumpkin pie (who makes pumpkin pies with a frying pan!?), and cookies, and cakes, and guano brownies, and pork roast, et cetera... If they were powered by fuel cells, they'd give fuel cells another purpose too.
Maybe... we'd be finally able to make rhubarb pie. Come on stoot, you know you want to...