In a large pot over medium heat, add the Italian sausage and cook until browned, breaking it apart with a wooden spoon, about 5-7 minutes.

Add the diced onion, garlic, carrots, and celery to the pot. Cook until the vegetables are softened, about 5 minutes.

Pour in the chicken broth and bring to a simmer. Stir in the Italian seasoning, salt, and black pepper.

Reduce heat to low and stir in the heavy cream and Parmesan cheese until melted and combined.

Add the chopped spinach and cook for an additional 2-3 minutes until wilted.

Taste and adjust seasoning if necessary. Serve hot with extra Parmesan cheese on top if desired.