Place the burger patties in the air fryer basket in a single layer. Air fry for 6 minutes, flip and air fry for an additional 4-5 minutes or until internal temperature reaches 165° F.
If adding cheese, place a slice on each burger patty one minute before they are finished cooking.
Remove the burger patties from the basket, place it on a hamburger bun and add lettuce, tomato, and red onion.