Baked Fish in Cheese Sauce

Fish:
1-1/2 lbs White Fish, I usually use cod or tilapia
1 Tbsp Butter

-Preheat oven to 450
-Place fish in a greased baking dish
-Sprinkle with salt and pepper
-Top each piece with a little butter
-Bake until fish flakes with a fork

Sauce:
1/2 tsp Butter
4 oz Shredded Cheese, I use a mild white cheese, like Sargento's Roasted Garlic
1 Egg, beaten
1-1/2 tsp Salt
1-1/2 tsp Pepper
1/4 tsp Mustard Powder
1 cup Milk

-Mix together cheese, egg, mustard, salt and pepper
-In a sauce pan, scald milk
-Slowly stir in cheese mixture until sauce is smooth and thick

Pour sauce over fish, and serve immediately. I like to serve this over pasta so as to not waste any of the sauce.