In a large bowl, combine all the dry ingredients (cornmeal, flour, paprika, garlic powder, onion powder, thyme, oregano, cayenne, black pepper, salt, and celery seed). Mix well until evenly distributed.
Store the seasoning mix in an airtight container or jar for up to 3 months.
Prep the Fish: Pat your fish fillets (catfish, tilapia, or any white fish) dry with paper towels.
Dredge: Dip each fillet in buttermilk, beaten eggs, or a light coating of oil, then coat generously with the seasoning mix. Press the mixture onto the fish to ensure it sticks.
Air Fry: Preheat your air fryer to 400°F (200°C). Lightly spray the air fryer basket with cooking spray or brush with oil to prevent sticking.
Place the coated fish fillets in a single layer in the air fryer basket (avoid overcrowding). Lightly spray the top of the fish with cooking spray or brush with oil to help it crisp up.
Air fry for 10-12 minutes, flipping halfway through, until the fish is golden brown and crispy. Cooking time may vary depending on the thickness of the fillets.
Serve: Remove the fish from the air fryer and let it rest for a minute. Serve with hushpuppies, coleslaw, and tartar sauce for a complete hillbilly fish fry experience.