1 large Vidalia (or sweet) onion, peeled Nonstick cooking spray Olive oil, for spraying
Put the flour into a bowl large enough to dip the onion. Put the eggs and buttermilk into another bowl, and the panko and seafood seasoning into a third bowl. Reserve.
Trim the top of the onion to create a flat surface. Leave root end intact. Turn the onion over, so the root end faces up, and rest it on its flat surface.
Without piercing the root, cut the onion into 4 wedges. Also without piercing the root, cut each wedge in half; repeat until wedges are about 1/4 inch thick.
Turn the cut onion over and carefully, without breaking the pieces off the root, separate the layers; the separated onion will resemble a flower with petals.
Dredge onion in flour, shake off excess before dipping into the egg mixture, and then, finally, coat each layer evenly with the panko mixture.
Place the Air Fryer Basket onto the Baking Pan. Spray the basket with the nonstick cooking spray. Put the panko-crusted onion into the basket. Spray with oil. Set to Air Fryer at 400°F for 10 minutes, or until golden and crispy.