Out to Lunch (Katie Kazoo, Switcheroo #2) by Nancy E. Krulik

It’s been a couple of weeks since Katie turned into the class hamster, and she’s beginning to hope that maybe her transforming days are through. But more excitement lies ahead for Katie as she becomes Lucille, the cafeteria lunch lady! Unfortunately, the principal isn’t too happy with a lunch lady who throws egg salad and starts food fights. . . so it’s up to Katie (back in her own body) and her classmates to save the day.