Yes, leftovers reheat well. If using the microwave, reheat individual casserole slices for about 45-60 seconds, until warmed through. You can drizzle a little maple syrup over the top before reheating if you're worried about the microwave drying it out. To reheat in the oven, place in an oven-safe dish, cover with foil, and reheat until warm, about 20-30 minutes.