Presbyterian Potatoes
["1 (32 oz.) pkg. frozen hash browns, thawed", "1 stick butter, melted", "1/2 onion, grated", "8 oz. cream cheese", "3/4 c. mayonnaise", "3/4 c. milk", "1 c. grated Cheddar cheese", "1 c. grated Longhorn cheese"]
["Mix cream cheese and mayonnaise.", "Add potatoes and mix.", "Layer potato mixture, cheeses and onions as many times as desired.", "Pour milk and butter over top.", "Sprinkle additional cheese on top. Bake at 350\u00b0 for 35 to 40 minutes."]
["frozen hash browns", "butter", "onion", "cream cheese", "mayonnaise", "milk", "Cheddar cheese", "Longhorn cheese"]