Heat a non-stick skillet over medium heat, add the pizza slice, and cover with a lid. Heat for 5-8 minutes until the cheese is melted.
Place the pizza on a microwave-safe plate with a cup of water next to it. Microwave on high for 1-2 minutes to prevent the crust from getting too chewy.
Place the pizza in the air fryer basket and cook at 350°F (175°C) for 3-5 minutes.
Preheat the toaster oven to 375°F (190°C) and bake the pizza for about 5-7 minutes.
Preheat the grill to medium heat, place the pizza directly on the grill, and cook for 5-8 minutes with the lid closed.
Preheat a cast iron skillet in the oven at 450°F (230°C), then place the pizza in the hot skillet and bake for 5-7 minutes.
Place the pizza on a baking sheet and broil on high for 2-3 minutes, keeping a close eye to prevent burning.
Place the pizza in a preheated panini press, close the lid, and heat for 3-5 minutes.