Prepare the onions by peeling the large onion and slicing it into thin, even rings, aiming for about ¼ inch in thickness.

Set up your coating stations with three bowls: one for flour, one for beaten egg, and one for breadcrumbs.

Coat each onion ring by first dipping it in flour, then in egg, and finally in breadcrumbs, pressing gently.

Preheat your air fryer to 375°F (190°C) for 3–5 minutes.

Arrange the coated onion rings in a single layer in the air fryer basket, lightly sprayed with olive oil.

Air fry the onion rings for 8–10 minutes, flipping halfway through to ensure even cooking.

Transfer the crispy onions to a paper towel-lined plate to absorb excess oil and serve immediately.