Boil potatoes in water in a separate pot if not already cooked.
Brown sausage and onion with a bit of olive oil or bacon grease to keep it from sticking.
Add garlic and saute.
Deglaze pan with chicken stock and bring to a boil. Adjust seasoning.
Drain and quarter potatoes. Add to the soup.
Add greens until just wilted.
Add cream if using. Do not allow to boil.
Grate Parmesan cheese on top of soup to serve.