Combine Mushrooms And Stock. Let Sit 30 Minutes. Remove Mushrooms And Chop, Reserve Liquid. Preheat Oven To 350*. Butter A Baking Dish. Layer In Potatoeos, Mushrooms, Sprinkle With Shallots Spices Etc. Repeat Until Gone. Combine Milk Sour Cream, And Mushroom Liquid, Pour Over Potatoes. Sprinkle With Hceese, Bke For 30 Minutes Or Util Cheese Is Lightly Browned. Sprinkle With Parsley Adn Serve.