Set your oven to 400 F and prepare a baking dish by oiling the bottom with light olive oil or vegetable shortening.

Season your cod fillets with Italian seasoning, pepper, and garlic salt. Cover fillets evenly with Boursin cheese. Pour tomato sauce into the dish and spoon over fillets.

Put in oven and bake for 13 minutes uncovered. Take out and spoon melted butter over and sprinkle grated Parmesan cheese.

Place back in the oven and bake for 12 minutes or until cheese has melted and browned a little bit.