Heat oil in skillet and brown meat on all sides.
Place meat in crock pot and sauté mushrooms and onion a few minutes in a skillet.
To the crock pot, add all remaining ingredients except sour cream and onions.
Pour mixture over meat and stir together.
Cook for 7-9 hours.
At serving time, spoon on sour cream and serve with noodles or rice.
Servings: 4 to 6