01 - Preheat air fryer to 400°F for 5 minutes to ensure optimal crisping.
02 - Separate onion slices into individual rings. Discard small centers or reserve for other uses.
03 - Arrange three shallow bowls. Combine flour, garlic powder, smoked paprika, salt, and pepper in the first. Whisk eggs and milk in the second. Place panko breadcrumbs in the third.
04 - Dredge each onion ring in flour mixture, shaking off excess. Dip into egg wash, allowing excess to drip off. Press firmly into panko crumbs to coat thoroughly and evenly.
05 - Place coated rings in single layer in air fryer basket. Lightly mist tops with cooking spray. Work in batches to avoid overcrowding.
06 - Cook at 400°F for 10–12 minutes, flipping rings halfway through cooking time, until golden brown and crispy throughout.
07 - Combine mayonnaise, minced chipotle pepper, adobo sauce, lime juice, and salt in small bowl. Mix thoroughly until smooth and well blended.
08 - Transfer hot onion rings to serving platter. Accompany with chipotle mayo for immediate dipping while hot and crisp.