Boil potatoes until almost, cut the top of a little cap and cut out with a spoon inside them. Prepare stuffing as fry onion, then chopped mushrooms, skinless sausage, spices and finally add the part of the interior of the potatoes. At the bottom of each potato put a little butter, add salt and filled with stuffing, put a little more butter, closed with lid, wrapped in aluminum foil and bake for 25 minutes. Remove from oven, dissolve fthe oil, is removed covers, is Grate cheese and bake for another 5 minutes.