Make crispy and flavorful onion rings using your Ninja Air Fryer. Slice onions into rings, dip them in a mixture of flour, buttermilk, and your choice of seasonings. Coat the rings with breadcrumbs and place them in the air fryer. Cook at 375°F for 10-12 minutes until they turn golden brown and crispy. Serve as a delicious side dish or snack.