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.
04 - Place panko breadcrumbs in a third bowl.
05 - Separate onion slices into rings. Dredge each ring in the flour mixture, then dip in the egg mixture, and finally coat thoroughly with panko breadcrumbs. Press gently so breadcrumbs adhere.
06 - Arrange 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 again with oil, until golden and crisp.
08 - Mix mayonnaise, chipotle peppers, lime juice, garlic powder, and salt in a small bowl until smooth. Refrigerate until ready to serve.
09 - Serve crispy onion rings hot with chipotle mayo for dipping.