Crispy onion rings are a delicious side dish or snack that can be made in your Ninja air fryer. Slice onions into rings, dip them in a mixture of flour, eggs, and breadcrumbs, then air fry them until they are golden and crispy. The air fryer ensures that the onion rings cook evenly and develop a satisfying crunch. Serve them with a side of dipping sauce for a tasty treat.