In a large bowl add the meatball ingredients, except the rice. With clean hands mix these ingredients together, add rice and mix in evenly. Form the balls, I made them about the size of 2 tablespoons, I made a total of 20 meatballs.
Mix the sauce ingredients in a small bowl until combined.
Spray the slow cooker with non-stick spray. Add a layer of meatballs and drizzle over some sauce. Do this a few times, until all the meatballs and sauce are gone.
Cover and cook on LOW for 5 hours without opening the lid during the cooking time.