Cover and cook on low for 6-8 hours or on high for 3-4 hours until the beef is tender.
In a small bowl, mix sour cream and flour until smooth. Stir this mixture into the slow cooker and let it cook for an additional 15-30 minutes on low to thicken the sauce.
Serve hot, garnished with fresh parsley.
Notes
This dish is perfect for busy days and can be served over egg noodles, rice, or mashed potatoes.