Start with the cooking method you’re using (fry, grill, or bake) and choose the substitute that matches the texture you want.
Use the listed ratio (for example, 1:1) and cut portions to the same thickness as your original catfish fillets.
Prep for doneness: pat seafood dry; brine/pound chicken; squeeze mushrooms after slicing.
Season to close the flavor gap: add salt and your standard fish seasoning to the protein surface before breading or roasting.
Adjust cook time: start checking 1–2 minutes earlier than you would for catfish so the replacement doesn’t overcook.