01 - Preheat air fryer to 400°F for 5 minutes to ensure even cooking.
02 - Separate onion slices into individual rings, discarding small center pieces.
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, then press firmly into panko crumbs to coat evenly on all sides.
05 - Place coated rings in single layer in air fryer basket. Lightly mist with cooking spray, working in batches to avoid overcrowding.
06 - Cook for 10–12 minutes at 400°F, flipping rings halfway through, until golden brown and crispy.
07 - While rings cook, whisk mayonnaise, minced chipotle pepper, adobo sauce, lime juice, and salt in small bowl until smooth.
08 - Transfer hot onion rings to serving platter alongside chipotle mayo for dipping.