Peel and slice large sweet onions into thick rings. Separate the rings and set them aside.
n a mixing bowl, combine flour, cornstarch, baking powder, salt, black pepper, and paprika. In another bowl, whisk together eggs and milk.
Arrange three shallow bowls: one with the dry flour mixture, one with the egg-milk mixture, and one with breadcrumbs for the final coating.
Dip each onion ring into the flour mixture, then into the egg mixture, and finally coat it thoroughly with breadcrumbs. Repeat for all the rings.
Preheat your air fryer to 375°F and lightly grease the basket with cooking spray, set cook time for 8-10 minutes.
Arrange the cooked onion rings into a tall stack for the iconic presentation. Serve immediately with your favorite dipping sauces like ranch or campfire sauce.