1-1 1/2 lb. haddock or any mild white fish
1/4 c. onion
butter
2 heaping tbsp. flour
1/4 tsp. salt
1/2 tsp. pepper
1 c. milk
1 c. shredded Cheddar cheese
3/4-1 c. sour cream
1 (4 oz.) can mushrooms

In large skillet, cover fish with water. Simmer until fish flakes easily, about 15-20 minutes. Drain and break into chunks; set aside. In a saucepan, saute onion in small amount of butter. Add flour, salt and pepper; add milk and cook until thickened. Remove from heat and stir in cheese until melted. Stir in sour cream and mushrooms. Carefully stir in fish pieces. Spoon into casserole and bake at 400 degrees for 15-20 minutes. Note: You can use plain yogurt instead of sour cream - gives it a slightly different taste but better for you. Makes 4-6 servings.