Crock Pot Beef Stroganoff

Ingredients

3 lb.	beef round steak, 1/2 inch thick
1/2 c.	flour
2 tsp.	salt
1/8 tsp.	pepper
1/2 tsp.	dry mustard
2	med. onions, thinly sliced and separated into rings
2 (4 oz. each) cans	sliced mushrooms, drained or 1/2 lb. mushrooms, sliced
1 (10 1/2 oz.) can	condensed beef broth
1/4 c.	dry white wine (optional)
1 1/2 c.	sour cream
1/4 c.	flour

Trim all excess fat from steak and cut meat into 3 inch strips about 1/2 inch wide.
Combine 1/2 cup flour, the salt, pepper and dry mustard; toss with steak strips to coat thoroughly.
Place coated steak strips in crock pot; stir in onion rings and mushrooms. Add beef broth and wine; stir well. Cover and cook on low setting for 8-10 hours.
Before serving, combine sour cream with 1/4 cup flour; stir into crock pot. Serve stroganoff over rice or noodles.