Combine the ground meat, bread crumbs, egg, parsley, salt and pepper in a bowl. Mix well and form into tiny meat balls. Bake on a cookie sheet for 30 minutes at 180ºC . Meanwhile, bring broth to a boil and add spinach. Cover and boil for 5 minutes. Add the meatballs to the hot broth, bring to a simmer. Stir in the cheese and serve immediately.