Baked Fish Au Gratin
["2 lb. whitefish fillets", "8 thin slices Cheddar cheese", "3/4 tsp. thyme", "1/2 c. chopped parsley", "2 medium onions, chopped", "2 Tbsp. butter", "2 Tbsp. flour", "1/2 tsp. salt", "1/8 tsp. pepper", "1 c. milk"]
["Place half of the fillets in greased baking dish and cover with 4 slices of cheese.", "Sprinkle with thyme and parsley.", "Saute onions and add.", "In top of double boiler, melt butter; stir in flour.", "Add salt and pepper.", "Cook until the mixture thickens.", "Pour over fish and bake at 400\u00b0 for 30 minutes."]
["whitefish fillets", "Cheddar cheese", "thyme", "parsley", "onions", "butter", "flour", "salt", "pepper", "milk"]