In a large pot or Dutch oven, cook the Italian sausage over medium heat until browned. Drain off any excess grease.
Add the chopped onion and minced garlic to the pot. Sauté until the onion is softened, about 5-7 minutes.
Pour in the chicken broth and add the cubed potatoes. Bring to a boil, then reduce heat and simmer for 15-20 minutes, or until the potatoes are tender.
Stir in the heavy cream, salt, and pepper. Heat through but do not boil.
Ladle the chowder into bowls and garnish with fresh chopped parsley.
Notes
This chowder can be made ahead of time and reheated gently. For a thicker chowder, you can mash some of the potatoes against the side of the pot.