01 - Preheat the air fryer to 400°F for 3 minutes to ensure optimal cooking temperature.
02 - Separate the sliced onions into individual rings and set them aside for breading.
03 - Prepare three shallow bowls: mix flour, cornstarch, garlic powder, smoked paprika, salt, and pepper in the first; whisk eggs and buttermilk in the second; and place panko breadcrumbs in the third.
04 - Dredge each onion ring in the flour mixture, dip into the egg wash, and finally coat thoroughly with panko breadcrumbs, pressing gently to adhere.
05 - Place the coated rings in a single layer in the air fryer basket and lightly spray with olive oil.
06 - Cook at 400°F for 10 to 12 minutes, flipping halfway through and spraying with more oil if necessary, until golden brown and crispy.
07 - While rings cook, combine mayonnaise, ketchup, mustard, pickles, hot sauce, smoked paprika, and garlic powder in a small bowl. Mix well and season to taste.
08 - Serve the hot onion rings immediately with the spicy burger sauce on the side for dipping.