In a small bowl, mix breadcrumbs with dressing mix.
Crumble beef and pork into very large bowl (you want room to work here).
Add seasoned breadcrumbs, beaten egg, cheese, parsley, onion, nutmeg, Italian seasoning, garlic, salt and pepper together with your hands until well incorporated. Form into twenty meatballs and place in slow cooker.
Cover completely with sauce and cook on LOW for 6 – 8 hours (I cook mine 8. This will produce fall-apart-at-the-touch meatballs, so be careful you don’t create a Bolognese sauce by mistake!).