Preheat the oven to 375�F.
Wash and pierce the potatoes with a fork. Bake for 1 hour until the skins are crisp.
Carefully cut the potatoes in half, scooping out all of the pulp except 1/8 inch attached to the skin. (Save the pulp for another use.)
Spray the inside of each skin with butter-flavored cooking spray. Sprinkle with fresh rosemary and black pepper. Bake for 5-10 minutes. Serve immediately.