Cook the potatoes in the oven until tender. Mash with the cream and cheese. Lay flat on a baking sheet lined with parchment and place into the fridge. Allow to cool at least a half hour but longer is better. Cook the onion and pepper in a pan for about a half hour to brown with some butter or oil. Meanwhile cut the sausage into 8 equal slices. Remember the disclaimer! Form the 8 slices into thin patties. Cut out rounds in the potato using a cookie cutter or a jar top. Finally place the potato round onto one of the sausage patties. Top with another patty and seal the potato into the sausage. Place into the fridge to seal for a half hour before grilling. Finally grill for about 10 minutes a side, or until the potato tries to come oozing out.