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Heating Up Pizza with a Ninja Grill
Leftover pizza on a Ninja Foodi grill: room-temp slice, grill setting 3 of 4, about two minutes — crisp bottom, melted top.
Cold leftover pizza reheat better on a Ninja Foodi grill plate than in the microwave. Start with a room-temperature slice so the middle warms before the crust burns.

Set the grill to setting 3 of 4 and give it about two minutes. That’s enough to re-crisp the bottom and melt the cheese without turning the crust into cardboard.

You want light char spots on the underside and cheese that stretches again. If the top is still cool, give it another 30 seconds. Microwave pizza goes soggy; this method keeps the crust closer to how it left the box.