T-dawg's Crock Pot Beef Stroganoff

The recipe's actually from my mama, though.

Ingredients:
beef cubes ("for stewing")
3/4 c. flour
1/8 tsp. pepper
2 tsp. salt
1/2 tsp. dry mustard
2 onions, chopped
2 cans or ~12oz. chopped mushrooms
1 can beef broth
1 c. sour cream

Combine 1/2 c. of the flour with the salt, pepper, and dry mustard in a large bowl. Toss with the meat chunks to coat them thoroughly. Place in crock pot. Stir in chopped onion and mushrooms. Add beef broth, stir well. Cover and cook on low for 8-10 hours.

A half hour before serving, combine sour cream and remaining 1/4 c. of flour. Stir into pot, combining gradually so cream doesn't curdle. Serve over egg noodles or rice.