Here are 5 popular ways to prepare leftover pizza. Which method fits your style? Method #1: Bake your pizza in the oven at 400° for about 15 minutes.Method #2: Place your pizza in a 400° toaster oven and give it a quick bake. Keep an eye on your toaster oven to avoid burning.Method #3: Heat your pizza on a warm skillet until the cheese has melted and crust has crisped.Method #4: Microwave your pizza. Method #5: Bypass heating your pizza altogether and eat it cold. (No judgment here.)