Add the meatballs to your crockpot.

In a medium mixing bowl, whisk together the cream of mushroom soup, onion soup mix, Worcestershire sauce, and beef broth.

Pour this over the meatballs.

Cook on low for 5-6 hours, or high for 2 1/2-3 hours.

One hour before cooking is done, add the sour cream.

Stir well and serve over egg noodles or rice.