In a shallow dish combine the panko, Parmesan, and parsley.
In a separate shallow dish, whisk together egg, mayonnaise, Dijon, garlic, salt, and pepper.
Pat the snapper fillets dry with a paper towel and cut into 4 ounce sections.
Dredge the fillets in the egg mixture, flipping to coat both sides.
Pick up the fillet pieces one at a time, letting excess drip off before placing in the panko mixture. Coat both sides of each fillet in panko mixture, gently pressing down on the fillets to get the coating to adhere. Repeat with all fillets.
Transfer fillets to your air fryer basket, taking care to not overcrowd as that will prevent the fish from crisping, spray the top of each fillet with avocado oil.
Cook in the air fryer at 400°F for 12-15 minutes. After the first 6-8 minutes, open the air fryer and flip over the fillets, spray again with oil and then continue cooking.
You might need to adjust the cooking times depending on the kind and the thickness of the fish that you’re using and the model of your air fryer. Fish is ready when it’s easily flaked with a fork.