Frozen Onion Rings in the air fryer works best if you cook them right from frozen. You do not need to thaw your onion rings.
Place the frozen onion rings in the air fryer basket. Cook for 5-6 minutes at 350 °F. Shake or rotate the food halfway through cooking.
Add more time as needed until they warmed and crispy to your liking. They will be fully cooked through once the internal temperature reads 165 °F on an instant read food thermometer.