Heat the butter in a pan. Sauté the shallot and mushrooms, add the potatoes, cook briefly. Pour in the stock, bring to the boil, cover and simmer for approx. 15 mins., add the cream, bring to the boil. Blend the soup, season.
Heat the clarified butter in a non-stick frying pan. Fry the thyme and strips of Mostbröckli for approx. 2 mins. until crispy, remove and set aside. Fry the mushrooms in the same pan for approx. 5 mins. per batch until golden brown, season. Plate up the soup, top with the mushrooms, Mostbröckli and thyme.