01 - Preheat the air fryer to 400°F for 3 minutes.
02 - Separate onion slices into individual rings and set aside.
03 - In a shallow bowl, combine flour, cornstarch, garlic powder, smoked paprika, salt, and black pepper.
04 - In a second bowl, whisk together eggs and buttermilk until well combined.
05 - Place panko breadcrumbs in a third shallow bowl.
06 - Dredge each onion ring first in the flour mixture, then dip into the egg mixture, and finally coat with panko breadcrumbs, pressing gently to adhere.
07 - Place the coated rings in a single layer in the air fryer basket and lightly spray with olive oil.
08 - Cook at 400°F for 10 to 12 minutes, flipping halfway through and spraying again if needed, until golden and crisp.
09 - While the onion rings cook, combine mayonnaise, ketchup, Dijon mustard, chopped pickles, hot sauce, smoked paprika, garlic powder, salt, and pepper in a bowl; mix thoroughly and adjust seasoning to taste.
10 - Serve the crispy onion rings hot, accompanied by the spicy burger sauce for dipping.