Begin by peeling and thinly slicing the onions into even rings, about a quarter-inch thick.

Gather three bowls: one for flour, one for beaten egg, and one for breadcrumbs. Optionally mix seasonings into breadcrumbs.

Dip each onion ring into the flour, then into the egg, and finally roll it in the breadcrumbs for even coating.

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

Lightly spray the air fryer basket with olive oil and arrange the coated onion rings in a single layer.

Set the timer for 8-10 minutes, shaking the basket halfway through for even cooking.

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