Crock Pot Beef Stroganoff

I totally LOVE Beef Stroganoff and I have already put a GREAT recipe for it on here, BUT it always seemed a little tedious to me so I didn't make it very often. Never fear! I have found the solution! This recipe is DELISH {AND} all you do is throw everything in your crock pot! Yes, I know I could totally KISS whoever it was who invented the crock pot, they have made my life easier! I found this recipe over at Tasty Kitchen and YES I did alter it, don't I always?  It is just because I am Lazy and try and use the stuff I have in my pantry instead of going to the store.

Crock Pot Beef Stroganoff 
(8 servings)

3 lbs. Beef round steak
1/2 cup flour
2 t salt
1/4 t pepper
1/2 t dry mustard
1 onion, sliced thin and separated
1/2 lb fresh mushrooms, sliced
1 (14 oz) can beef broth
1 1/2 cups sour cream
1/4 cup flour
egg noodles

Cut meat into 1/2 inch by 3 inch strips. (I found that sticking my meat in the freezer for just 15-20 minutes makes it much easier to slice). Combine the 1/2 cup flour, salt, pepper and dry mustard then use this mixture to coat the strips of meat. Combine the meat, onions, mushrooms and broth in the crock pot and stir well.  Cook this on low for 8-10 hours.  Before serving combine the sour cream with the 1/4 cup of flour and stir into the meat mixture.  Let this heat through and thicken up a bit.  Serve over prepared noodles or rice.