In a small, shallow bowl, place the flour. In a second small bowl, beat the eggs. In a third bowl, combine the bread crumbs, chili powder, garlic powder, ½ teaspoon kosher salt, and cayenne. Last, line a baking sheet with parchment paper and keep it handy to use as a work surface.
Separate the onion slices into rings. Working a few at a time, dip the onion rings in the flour, then the eggs, then the bread crumb mixture, turning the rings and patting the panko as needed to adhere (smaller rings are easier than larger ones).
Place on the prepared baking sheet. Repeat with remaining rings.
Preheat your air fryer to 360°F. Coat the air fryer basket with nonstick spray.
Place the onion rings in a single layer in the basket, then mist the tops with more nonstick spray.
Air fry the onion rings for 7 to 9 minutes, until golden and crisp (no need to flip them). Remove from the basket to a serving plate and immediately season with a pinch of salt. Repeat with the remaining onions. If you’d like to serve all batches hot at once, set the air fried rings aside as they finish, then reheat them all together in a single batch in the air fryer for a minute or two (it’s OK to stack when reheating). Enjoy hot with BBQ sauce or dip of choice.
Notes
TO STORE: Refrigerate onion rings in an airtight storage container for up to 3 days.
TO REHEAT: Recrisp leftovers on a baking sheet in the oven at 350°F.
TO FREEZE: Lay leftovers in a single layer on a baking sheet, then freeze until solid. Transfer the frozen rings to an airtight, freezer-safe storage container or ziptop bag. Freeze for up to 3 months. Reheat from frozen.