Preheat the air fryer to 375°F (190°C) for 5 minutes.
If desired, spray the air fryer basket lightly with cooking spray. Arrange the frozen breaded onion rings in a single layer in the basket without overlapping; stand some on the edges if needed so air can circulate.
Air fry the onion rings at 375°F for 3 minutes.
Toss the basket or gently flip the onion rings with tongs or a spatula, then continue air frying for an additional 2–7 minutes until golden brown and crisp to your liking.
Transfer the cooked onion rings to a serving dish, sprinkle with cilantro if using, and serve with blue cheese dressing, honey mustard, or your preferred dip once they have cooled slightly.