Mist an air fryer tray with the cooking spray.
Cut your cod fillets into 12 even pieces. I started with 3 fillets, and cut them width-wise into 4 pieces each. (Note: if you cut your fish differently than I did, you may need more or less breading than I am providing in this recipe.)
Mix the cornmeal, spelt flour, Parm, basil, garlic powder, onion powder, and black pepper in a medium-sized bowl. Put the milk in a second bowl. (Did you check out the recipe video?)
Bread your fish sticks by dipping them first in the milk and then in the cornmeal breading mixture. Place breaded fish sticks in a single layer on the air fryer tray. You should have just enough breading to completely cover the fish sticks.
Drizzle the melted butter over the fish sticks.
Air fryer directions: Put the tray with the fish sticks on the top rack in your air fryer oven. Air fry for 7 minutes at 400°F (200°C). Then carefully flip the fish sticks, put the baking tray back on the top rack, and air fry for an additional 7 minutes at 400°F (200°C). (No air fryer? Use the oven directions below instead!)
Alternate oven baked directions: Put the fish sticks on a metal cookie sheet that was misted with cooking spray. Broil for 5-8 minutes in the oven.
Note: However you cook your fish, use a meat thermometer to check that the it reached a minimum safe internal temperature of 145°F (63°C). Extend the cooking time if it's not at a safe temperature.