Chicken Tetrazzini
["4 boneless chicken breasts", "1 (8 oz.) can chopped mushrooms", "8 to 12 oz. skim Mozzarella cheese, shredded", "1 can mushroom soup", "4 Tbsp. butter", "6 Tbsp. flour", "1/4 tsp. pepper", "1/2 tsp. celery salt", "2 c. milk", "2 tsp. salt", "1 pkg. (3 c.) medium noodles", "4 oz. sour cream"]
["Garlic salt may be substituted for regular salt if desired."]
["chicken breasts", "mushrooms", "Mozzarella cheese", "mushroom soup", "butter", "flour", "pepper", "celery salt", "milk", "salt", "noodles", "sour cream"]