Mix together ground round, ground pork, breadcrumbs, parsley, salt, mustard, Worcestershire, and egg; be sure to fully combine. Form meat into 24 1-inch spheres.
Grease a nonstick pan with cooking spray and heat over medium heat. Arrange meatballs in pan and cook until brown on all sides, about 10 minutes. Take meatballs out of pan and let rest.
In same skillet, cook garlic for 30 seconds. Pour in wine and let boil over medium heat for 1 minute. Place the meatballs back in pan, place lid on pan, and cook 5 minutes; meatballs should be cooked through when finished. Take pan off of heat.
Take meatballs out of pan and place on a serving platter; leave liquid in pan. Spoon sour cream and pepper into wine sauce and whisk well. Serve sauce over meatballs or on the side.