Combine ground beef, oatmeal, oat fiber, milk, egg, onions and spices until well mixed. With a medium Cookie Scoop , fill the scoop with the meatball mixture. Place a small square of cheese in the center of the meatball. Release the meatball into your hand. Shape the meat mixture around the cheese. Place in a baking pan. Bake at 350 degrees F. for 30 minutes. Blend sauce ingredients together. Pour over meatballs. Bake for 10 minutes. Serve with toothpicks. Makes 18 meatballs--9 servings