In a soup pot, melt the butter and add the leeks, saute for about 10 minutes being careful to not brown the leeks.
In a separate pan, brown the Italian sausage until thoroughly cooked, drain and set aside.
When the leeks are softened, add the rest of the ingredients and stir
Bring to a boil and then simmer for about 40-50 minutes
With a potato masher, smash some of the potatoes to thicken the soup. Serve and enjoy!