Dice the bacon, as well as the onion and garlic. Cut the mushrooms into leaves and then cut again in the middle.
Leave the bacon in the pan and some fat and then add the onion. When they are lightly browned, add the garlic and then the mushrooms. Fry well and deglaze with the milk. Let it boil down and then add the sour cream. Simmer for 15 minutes.
Briefly toast old bread slices (wheat parisettes with whey) or toast (sandwich toast bread with spelled (toast bread II)) and place on a baking sheet.
Wash and chop the parsley. Mix with the pan just before the end of the cooking time.
Preheat the oven to 180 ° C / preheat convection. Spread the cooked pan on the toast with a spoon and cut the cheese open. Nice who has Munster. Since it is leftover kitchen, another is also possible. Bake in the oven until the cheese melts (approx. 15 minutes). A fine salad goes well with it.