To make ahead of time, cover potato mounds on cookie sheet and refrigerate no longer than 24 hours. Heat oven to 425ºF. Brush potatoes with butter. Bake 15 to 18 minutes or until hot.
You can double this recipe to serve a larger crowd. Just be certain you have a large enough Dutch oven or other pan for boiling the potatoes and enough refrigerator space to hold two cookie sheets if you make these ahead of time.