Bake potatoes until soft. Let stand until cool enough to handle. Cut potatoes lengthwise into quarters. With spoon, scoop out potato, leaving 1/8″ thick shell. Save potato flesh for other use. Brush skins with butter, both inside and out. Place, skin side down, in a single layer on a 12″ x 15″ baking sheet. Sprinkle with Mansmith’s Grilling Spice, bake at 500 about 12 minutes (until crisp). Remove from oven and sprinkle with cheeses. Broil until cheese melts. Serve with Dipping Sauce.