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Peel and slice the onion into ⅓ to ½ inch rings. Gently separate the onion rings and place them in a baking dish (or a large Ziploc bag.) Pour the buttermilk over the onion rings. Cover and refrigerate for 4 to 12 hours to marinate.
Once the onions have had plenty of time to soak in the buttermilk, preheat the air fryer to 400°F.
Drain the buttermilk off the onion rings. Set out two bowls. In the first bowl, combine the Panko breadcrumbs, cornmeal, flour, and Cajun seasoning. Mix well. In the second bowl, whisk the egg whites until very foamy.
Working in small batches, dip each onion ring in the egg whites to coat in foam, then dunk in the breading mixture. Make sure the onion rings are mostly coated and set aside. Whip the egg whites as needed when they deflate.
Place 5 to 8 onion rings in the air fryer basket at a time making sure not to overlap. Spray thoroughly with oil spray.
Air fry the onion rings for 5 minutes. Then open the basket, flip them over, spray the other side with oil, and continue air frying for another 5 to 7 minutes until golden and crispy.
Repeat with the remaining batches. Serve warm with favorite dipping sauces.