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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 350F. Lightly grease a medium
baking dish. Spread
potato mixture into the prepared baking dish, and
bake in the
preheated oven about 30 minutes.
