Thinly slice the beef and heath the butter and oil in a dutch oven over medium-high heat. Working in batched, quickly brown the ouside of the meat then remove and drain.
Use a splash of beef broth or white wine to deglaze then add mushrooms, onion, and garlic. Sautee until onions are translucent. Deglaze again with some beef stock.
Add remianing stock, soy, mustard, bayleaf, salt, pepper, tabasco, and worchestershire.
Reduce heat to low and simmer for 3 hours. Add thyme, and simmer for 10 minutes, then remove thyme sprigs and bayleaf. Add the sour cream and cream cheese and stir to incorporate. Taste and adjust seasoning as needed.
Meanwhile cook the noodle or rice over which the dish is served with parsley to garnish.