In a large mixing bowl, combine ground beef, ketchup, cracker crumbs, eggs, onion, red pepper, garlic powder, salt, and pepper together and mix until well combined. Form into 4 patties.
Place patties in the air fryer basket. Cook at 350 degrees for 12 minutes. Cook patties longer if need to 160 degrees.
Place cheese on patties while still in the air fryer basket and place back in the air fryer with it turned OFF for a couple of minutes. The residual heat in the air fryer will melt the cheese.
Place patties on buns and top with desired toppings. Serves 4.
Notes
Alternatively these patties can be cooked in a instead of an air fryer. Cook in a heated skillet on each side for 5-7 minutes. Then add 1 cup of water to the skillet and cook for 5 minutes until juices run clear.