Directions 1.Bring a large pot of salted water to a boil. Drop in potatoes, and cook until tender but still firm, about 15 minutes. 2.Transfer potatoes to a large bowl, and mash until smooth. Mix in the cream cheese, sour cream, garlic powder, salt, pepper and butter. Cover, and refrigerate 8 hours, or overnight. 3.Preheat oven to 350 degrees F (175 degrees C). Lightly grease a medium baking dish. 4.Spread potato mixture into the prepared baking dish, and bake in the preheated oven about 30 minutes. *Optional: Instead of steps 3 and 4 in recipe, after preparation put in crockpot on warm and let sit until ready to serve. I also put about 1/4 cup cubed butter on top of potatoes while in the crockpot.