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Drain the potatoes, and then return them to the pan. With the burner on low heat, mash the potatoes with a potato masher; the more steam that's released while you mash, the better. Mash for about 5 minutes. Turn off the burner.
Pour the mashed potatoes into a large casserole pan. Dot the surface with butter. Cover with foil and bake in the oven for 15 minutes. Remove the foil and continue baking for 10 more minutes. Serve immediately.