Mix Ahead Chicken Casserole
["1 (7 oz.) pkg. elbow macaroni", "3 c. chopped cooked chicken", "1 small onion, chopped", "1 (2 1/2 oz.) jar sliced mushrooms, drained", "2 c. (8 oz.) shredded American cheese", "2 c. milk", "1 can cream of celery soup, undiluted", "1/2 tsp. salt"]
["Cook macaroni, drain and add remaining ingredients to macaroni; mix well.", "Spoon into lightly greased 3-quart baking dish.", "Cover and refrigerate overnight or several hours.", "Remove from refrigerator and let stand at room temperature for 30 minutes. Bake, uncovered, at 350\u00b0 for 45 minutes.", "Yields 6 to 8 servings."]
["elbow macaroni", "chicken", "onion", "mushrooms", "American cheese", "milk", "cream of celery soup", "salt"]