Preheat the oven to 425 degrees F (220 degrees C). Line a baking sheet with aluminum foil and coat with cooking spray.
- In a shallow dish, stir together the cornmeal, paprika, thyme, salt, celery seed, onion powder, garlic powder, and pepper. Dip the catfish fillets in milk, then place them into the cornmeal mixture and coat liberally; place on the greased baking sheet. (Which I coat with Olive Oil) Coat the tops of the fillets with cooking spray until wet. (I have never done this, but you can if you like.)
- Bake for 15 minutes in the preheated oven, or until fish is easily flaked with a fork.
- *** I bake it a little longer than 15 minutes. At least until its looks and feels crunchy, and of course DONE.***