According to most Chicago-style afficionados, the oven is the ideal method for reheating deep dish. It takes the longest, but the rewards are well worth it![2] X Research source

Leave a small gap between each slice of pizza you’re reheating so that they cook evenly. You can use oven-safe parchment paper instead of aluminum foil if you prefer. If you don’t have cooking spray, pour 1⁄2  tsp (2. 5 ml) of vegetable oil on the foil and spread it out with your finger or the back of your spoon.

Some people think that little splash of water is pointless. These people are wrong, and no one will ever convince us otherwise. That little splash of moisture is the difference maker when it comes to keeping the pizza from drying out.

Don’t wait so long that the cheese on the side of each slice completely melts and puddles up on the foil! Let the pizza cool off for 2-3 minutes so that the cheese firms up a bit and you don’t burn your tongue.

After the oven, the skillet is your best bet when it comes to reheating deep dish. You can use a regular nonstick skillet if you’d like, but just know that you’re being judged silently in the distance by pizza snobs.

If you do not have a cover for your skillet, lay aluminum foil over the skillet. Covering the pizza will insulate it and allow the heat to build up at the top of the pizza. If you don’t cover the skillet, your crust will burn and the cheese at the top won’t be warm.

Give your pie a minute or two to cool off once you plate your slices.

On some toaster ovens, you can’t set a specific temperature. In this case, use the “medium” setting. That should fully reheat your pizza. After the skillet and oven, the toaster oven is widely acknowledged to be the most reasonable option for reheating deep dish.

You can heat multiple slices this way if they fit on the rack. Just leave a gap between each slice so that they aren’t touching.

Let your slices cool off a bit before you bite into them.

The air fryer is a controversial option among deep dish purists. Don’t let anyone deter you here, though; you may be on the cutting edge of deep dish reheating experimentation, but many folks find the air fryer to be the best option.

If you don’t have a tray at the bottom to catch drippings, you can lay a sheet of aluminum foil at the bottom of the air fryer.

Let your pizza cool off for a minute or two before you enjoy.