01 -
Place frozen meatballs, ketchup, brown sugar, beef broth, mustard, Worcestershire sauce, and onion powder into a 3-quart or larger slow cooker.
02 -
Cook on high heat for 2 to 2.5 hours or on low heat for 3 to 4 hours until heated through.
03 -
Switch slow cooker to warm setting. Serve meatballs topped with chopped parsley if desired.