Start campfire, grill or oven to approximate 400 to 425 F degrees.
Carefully transfer cut potatoes to large cast iron skillet or Dutch oven. Brush skins with olive oil and season with salt and pepper. Cover with lid or a tight seal of aluminum foil and stick in coals of fire or on grill (preferably with lid down) for approximately 60 minutes, or until potatoes are tender.
Sprinkle potatoes and sauce with slice mushrooms and pre-cooked sausage crumbles. Add any other ingredients you might like. Cover with foil or lid again and return to heat for additional 15 minutes or until everything heated through.