Creamy Au Gratin Potatoes
["1/4 c. chopped onion", "2 (10 1/2 oz.) cans cream of celery or cream of mushroom soup", "2 (6 oz.) pkg. cream cheese, cubed", "3 to 4 c. frozen Southern-style hash browns or potatoes O'Brien", "3/4 to 1 c. shredded Cheddar cheese"]
["Preheat oven to 400\u00b0.", "Grease a 13 x 9 x 2-inch baking dish. In a saucepan, over medium heat, cook onion until tender.", "Stir in soup and cream cheese cubes.", "Cook, stirring constantly until smooth and hot."]
["onion", "cream of celery", "cream cheese", "frozen Southern-style hash", "Cheddar cheese"]