Make crispy and flavorful onion rings in your Ninja Air Fryer. Slice onions into rings, dip them in a mixture of flour, breadcrumbs, and your preferred seasonings. Preheat the air fryer to 375°F and cook the onion rings for 10-12 minutes until golden brown and crispy. Enjoy these homemade onion rings as a tasty side dish or a crunchy snack.