Other great add-ins: Cannellini Beans Fennel seeds Bacon Celery, fine diced Minced garlic Red Pepper Flakes
Hot or Mild is fine but get good quality as this provides the herby flavor to the soup. I usually get the links it is easier to find, but ground Italian Sausage is fine.
In a soup pot or large Dutch oven on a stovetop, boil the sliced potatoes about 5-10 minutes, until tender. Drain and set aside in a colander or bowl.
Crumble the Italian sausage and add the onions. Cook until sausage is fully cooked, and onions are translucent. Drain off excess fat.
Stir in the chicken broth and oregano. Bring to a boil and simmer for 20 minutes. Add the milk and bring back to temp if necessary.
Add the potatoes, heavy cream and kale. Cook an additional 3-5 minutes or until the kale has wilted.
Salt and Pepper to taste, Adjust seasonings and heavy cream if desired, Serve hot.