Brown sausage in a large saucepan over medium-high heat. Add onion and carrot: saute 3 minutes. Stir in mushrooms and garlic, and saute another 3 minutes.

Add broth and tomatoes: bring to a boil. Stir in pasta and simmer uncooked, about 10 minutes (or according to package directions). Add the spinach and cook about 1 minute, or until wilted.

To serve, place cubes of cheese in each serving bowl, then ladle over soup to melt. Garnish with Parmesan and basil.