Preheat oven to 400*F.
Scrub potatoes, pierce with fork and bake 1 hour. Remove potatoes from oven and reduce oven temperature to 375*F.
With a sharp knife, cut a lengthwise "lid" about 1/2" down from the top of potato to prepare as an entree. Scoop pulp out of potato and place it in a bowl. Set shell aside.
Mash potatoes with potato masher or a fork. Add cheeses, onions, pepper and garlic powder. Stir to mix well. Fill potato shells with mixture, dust with paprika and bake 25 minutes at 375*F.
To prepare as a side dish, cut potatoes in half and fill according to intructions.