Slice onions into half-inch thick rings.
Separate each ring carefully with your fingers.
Remove the thin inner skin if needed.
Pat the rings dry with paper towels.
This helps the coating stick better.
Place flour in the first bowl.
Mix eggs and buttermilk in the second bowl.
Combine panko, garlic powder, paprika, salt, and peppers.
Put this mixture in the third bowl.
Line up bowls in order for easy coating.
Dredge each ring in flour first.
Shake off any excess flour gently.
Dip into the egg mixture completely.
Let extra liquid drip off briefly.
Press into the panko mixture firmly.
Coat both sides evenly and thoroughly.
Set air fryer to 375°F (190°C).
Let it preheat for 3-5 minutes.
This ensures even cooking from the start.
Spray basket with cooking spray generously.
Place onion rings in a single layer.
Don't overcrowd or they won't crisp up.
Leave space between each ring for airflow.
Spray tops of rings with cooking spray.
Cook for 8-10 minutes total cooking time.
Flip rings halfway through cooking carefully.
They should turn golden brown and crispy.
Cook in batches if needed for best results.
Remove rings when perfectly golden and crispy.
Let them cool for one minute only.
Serve hot with your favorite dipping sauce.