Mix the dried onions, sea salt, garlic powder, pepper and water into the ground beef, and form into 4 patties, approximately ½ inches thick
Place patties onto air fryer tray, and make an indentation in the middle with your finger or thumb
Preheat air fryer to 400 degrees, and cook for 15 minutes, turning patties over about halfway through cook time.
Add cheese slices during the last few seconds of cooking
Notes
Check for doneness before adding cheese. Ground beef burgers are done when internal temperature reaches 160 degrees, according to a meat thermometer.Thinner burgers require less cooking time, and more time may be needed for thicker burgers.