01 - Preheat air fryer to 400°F for 5 minutes.
02 - In a shallow bowl, combine flour, baking powder, smoked paprika, garlic powder, and salt.
03 - In a second bowl, whisk together eggs and buttermilk until smooth.
04 - Place panko breadcrumbs in a third bowl to create a three-part dipping station.
05 - Separate onion slices into individual rings. Dredge each ring in flour mixture, dip in egg mixture, then coat thoroughly with panko breadcrumbs, pressing gently to adhere.
06 - Place onion rings in a single layer in the air fryer basket. Spray lightly with olive oil.
07 - Air fry in batches for 10-12 minutes, flipping halfway through and spraying with additional oil, until golden brown and crispy.
08 - Combine mayonnaise, chipotle peppers, lime juice, garlic powder, and salt in a small bowl. Mix until smooth and refrigerate until serving.
09 - Serve onion rings immediately with chipotle mayo for dipping.