Pre-heat air fryer to 350 degrees.
Place a foil square on a flat surface.
Place the potatoes, carrots, and onions on the foil.
Top with a hamburger patty.
Season to your taste with salt and pepper.
Add a slice of cheese (or use shredded cheese).
There's no need to add any butter/oil. The fat from the patty will be plenty.
Wrap up the foil pack, and place in the air fryer.
Air fry for 20 minutes.
Remove from air fryer, open the packet, and enjoy.