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 to 9 hours. At serving time, spoon on sour cream and serve with noodles or rice. This recipe yields 2 servings.