Make Ahead Chicken Casserole
["1 (7 oz.) pkg. elbow macaroni", "3 c. cooked chicken", "1 small onion, chopped", "2 c. (8 oz.) shredded American cheese", "2 c. milk", "1 (10 oz.) can celery soup", "1/2 tsp. salt", "1 (2 1/2 oz.) jar sliced mushrooms"]
["Cook macaroni as directed; drain.", "Add remaining ingredients to macaroni.", "Mix well.", "Spoon into lightly greased 3-quart baking dish.", "Cover and refrigerate for several hours or overnight."]
["elbow macaroni", "chicken", "onion", "American cheese", "milk", "celery soup", "salt", "mushrooms"]