Day Before Mashed Potatoes

Ingredients : 9 potatoes, peeled and cubed 6 ounces cream cheese 1 cup sour cream 2 teaspoons onion powder 1 teaspoon salt 1/4 teaspoon ground black pepper 2 tablespoons butter Preparation : Bring a large pot of salted water to a boil. Drop in potatoes, and cook until tender but still firm, about 15 minutes. Transfer potatoes to a large bowl, and mash until smooth. Mix in the cream cheese, sour cream, onion powder, salt, pepper and butter. Cover, and refrigerate 8 hours, or overnight. Preheat oven to 350 degrees F (175 degrees C). Lightly grease a medium baking dish. Spread potato mixture into the prepared baking dish, and bake in the preheated oven about 30 minutes