I'm by no means a catfish expert but I have cooked a lot of halibut, cod, and other mild white fleshed ocean fish. I'd first try putting it on foil, sprinkling with Johnnies Seafood Seasoning, add a little butter, onion slices, maybe a splash of white wine or lemon juice, close up the foil and bake at about 350 until it just flakes - be careful not to over cook.