Chicken Tetrazzini
["1 c. celery, chopped", "1 medium green pepper, chopped or 1 small jar pimentos", "2 c. chicken broth", "1 (8 oz.) can mushrooms (optional)", "1 1/2 cans cream of mushroom soup", "1 medium onion, chopped", "2 Tbsp. butter or margarine", "3 c. cooked chicken, diced", "1 (8 oz.) pkg. spaghetti, cooked", "3 Tbsp. grated Cheddar cheese"]
["Saute celery, green pepper and onion in butter until tender and golden brown; set aside.", "Heat chicken in broth and add mushroom soup, mushrooms and sauteed mixture.", "Grease a 9 x 14-inch Pyrex dish.", "Put half of spaghetti in the bottom of the dish, then half of the chicken mixture.", "Repeat layers.", "Top with grated cheese.", "Bake at 350\u00b0 for 30 minutes."]
["celery", "green pepper", "chicken broth", "mushrooms", "cream of mushroom soup", "onion", "butter", "chicken", "Cheddar cheese"]