COMBINE the ground meat, bread crumbs, egg, parsley, minced garlic and salt and pepper in mixing bowl. Mix well with a fork and form into tiny meat balls (shown are about the size of a golf ball, but traditional meatballs are a bit smaller) with your hands.
PLACE meatballs on a greased baking sheet and bake for about 25 minutes at 350F, until brown. (See ALTERNATE, below)
ABOUT ten minutes before serving, bring the chicken broth to a boil, add the spinach and cook until tender. Add the meatballs and return soup to a simmer. Stir in the Pecorino cheese and serve.
ALTERNATE: you can saute the meatballs in olive oil until brown and procede with step 3 (above), or bring your chicken stock to a low boil, add the uncooked meatballs, simmer for about 25 minutes, add the spinach, cook until tender, stir in the cheese and serve