In a dutch oven, or other large pot, add the Italian sausage and sauté until no longer pink. Drain, and return to the pan. Add in the onions, peppers and garlic. Cooking until just softened.
Add in the seasonings, tomato paste, diced tomatoes (with juice), broth and kale.
Bring to a boil, then reduce to a simmer. Let simmer for 15 – 20 minutes to meld flavors. Ladle into bowls and serve. Add a sprinkle of cheese if desired.