In a medium mixing bowl, combine beef, egg, soup mix and panko crumbs
Using your hands, mix together until all ingredients are combined. Roll into balls (aprox 1 tbsp in size) and place in the bottom of a small/medium slow cooker.
Using the same bowl used to mix beef (no need to dirty another bowl), combine ketchup, vinegar, sugar and 1/3 cup water. Stir well. Pour into slow cooker over top of meat balls. Cover and cook on low for 4-6 hours or high for 2-4 hours or until meat balls are cooked thru.
30 minutes before serving, mix cornstarch with 1 cup of cold water in a cup or small bowl. Pour into slow cooker and stir. Return cover and let cook for the last 30 minutes until serving.
Serve over top of rice.
Recipe Notes
This is a great nut free slow cooker meal for any night of the week.