Overnight Tuna Casserole
["1 can cream of celery soup", "1 c. milk", "1 (6 1/2 oz.) can water-pack tuna, drained", "1 c. uncooked elbow macaroni", "1 c. frozen green peas", "1/2 c. chopped onion", "1 c. shredded Cheddar cheese"]
["Reserve 1/4 cup Cheddar cheese.", "Whisk soup and milk in 2-quart microwave-safe bowl until well blended.", "Stir in remaining ingredients, except reserved cheese.", "Cover and refrigerate at least 12 hours or overnight."]
["cream of celery soup", "milk", "water-pack tuna", "elbow macaroni", "frozen green peas", "onion", "Cheddar cheese"]