Heat oven to 375°F. Spray 15x10x1-inch pan with cooking spray. In large bowl, mix all meatball ingredients. Shape into 1-inch meatballs. Place in pan. Bake 15 to 20 minutes or until no longer pink in center and juice is clear.
In 2- to 2 1/2-quart slow cooker, mix all sauce ingredients except parsley until well blended. Add meatballs.
Cover and cook on Low heat setting 2 to 3 hours or until thoroughly heated. Stir in parsley. Serve meatballs with cocktail forks or toothpicks. Meatballs will hold on Low heat setting up to 2 hours; stir occasionally.