Creamy Sausage Potato Soup

Name: Creamy Sausage Potato Soup
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: American
Ingredients: 1 tablespoon olive oil; 1 onion (diced); 5 to 7 cloves garlic (minced); 1 pound ground Italian sausage; 3 Russet potatoes (diced); kosher salt, pepper, crushed red pepper flakes; 4 cups chicken broth; 1 tablespoon chicken base (I used Better than Bouillon); 1 tablespoon fresh thyme leaves (optional); 4 cups chopped kale or spinach; 1 pint heavy cream; 1 cup shredded parmesan cheese (plus more to sprinkle over top when serving)