01 - Preheat the air fryer to 400°F.
02 - Separate onion slices into individual rings; reserve small inner pieces for another use.
03 - Arrange three shallow bowls: one with flour, salt, and pepper; a second with beaten eggs and buttermilk; and a third with panko breadcrumbs mixed with smoked paprika.
04 - Dredge onion rings in the flour mixture, shaking off excess; dip into the egg mixture, then press into the panko mixture until fully coated.
05 - Place breaded rings in a single layer in the air fryer basket; lightly spray with olive oil.
06 - Cook for 10 to 12 minutes, flipping halfway through and spraying again with olive oil, until golden and crispy.
07 - Combine mayonnaise, ketchup, mustard, chopped pickles, pickle juice, garlic powder, smoked paprika, salt, and pepper in a bowl; mix well and adjust seasoning as desired.
08 - Serve hot onion rings alongside the burger sauce.