Mashed Potato Bake
["9 large potatoes", "2 (3 oz.) pkg. cream cheese", "1 c. sour cream", "1 tsp. salt", "1 tsp. onion salt", "1 tsp. pepper", "4 Tbsp. butter"]
["Cook, drain and mash potatoes.", "Add remaining ingredients and beat until fluffy.", "Refrigerate overnight.", "Bake at 350\u00b0 for 45 minutes."]
["potatoes", "cream cheese", "sour cream", "salt", "onion salt", "pepper", "butter"]