Chicken Tetrazzini
["4 to 6 chicken breasts", "1/2 lb. sliced mushrooms", "4 tsp. margarine", "2 cans cream of chicken soup", "1 pt. sour cream", "1 small onion, chopped", "2 Tbsp. cooking sherry", "1 lb. spaghetti, cooked"]
["Cook chicken in boiling water.", "Shut heat off.", "Let chicken sit in water for 10 minutes.", "Cut into small pieces.", "Combine with all other ingredients.", "Cover with Parmesan cheese.", "Cover with foil.", "Bake at 300\u00b0 for 40 minutes."]
["chicken breasts", "mushrooms", "margarine", "cream of chicken soup", "sour cream", "onion", "cooking sherry"]