Preheat the air fryer to 400°F.
Dredge the onion rings in the flour, then dip them in the beaten eggs, and finally coat them in the panko breadcrumbs.
Spray the air fryer basket with a light coating of oil and arrange the breaded onion rings in a single layer.
Air fry for 8-10 minutes, flipping halfway, until golden brown and crispy.
Season with salt and pepper.
Serve the onion rings with beet ketchup, if desired.
