Preheat oven to high broil and spray a baking sheet with non-stick spray.
Combine all ingredients, except marinara, chicken broth, and parmesan in a large bowl and mix well. Form into 1 inch balls and place on the prepared baking sheet. Broil for about 5 minutes until lightly browned (meatballs will not be fully cooked).
Place the browned meatball the slow cooker and add the marinara and broth. Cook on low for 4 hours. Sprinkle with parmesan cheese and serve.