Chop up the spinach.
Mix together all the ingredients, saving 1/4 cup of the breadcrumbs.
Roll the mixture into balls and let a helper roll them in breadcrumbs.
Brown the meatballs (try not burn them like me!).
Pour some sauce in the bottom of the crock-pot, put meatballs on top, then pour the rest of the sauce on top. Cook for 4 hours on low or 1 1/2 hours on high.
Instead of using the meatballs for sandwiches, I put them on top of some whole wheat pasta.