In a large pot brown sausage and onion over medium heat until no longer pink and onions are translucent (about 5 min). Stir in garlic for 30 seconds.
Stir in broth and tomatoes and simmer for 10 minutes. Stir in tortellini and heavy cream and simmer for 10 minutes max. Remove from heat and stir in spinach.
What to serve with Creamy Sausage Tortellini Soup