Take the sausage out of the casings and brown it in your pot over medium-high heat for 5 to 7 minutes.
Drain most of the fat but leave about a tablespoon, then add your onion and garlic to the pot.
Cook the onion and garlic with the sausage for 3 to 4 minutes until the onion is soft and clear.
Pour in your chicken broth and tomatoes with all the juice, then stir everything together really well.
Add your Italian seasoning, salt, and pepper to the soup and mix it all up so it's even.
Let the soup boil, then turn the heat to medium-low and let it simmer for 10 minutes without a lid.
Drop the tortellini and cook them for 5 to 7 minutes until they're tender and floating up.
Turn the heat to low, stir in the cream until it's mixed in, then add the spinach until it wilts down.
Taste your soup and add more salt or pepper if you want before you serve it nice and hot.
Scoop soup into bowls and put some Parmesan cheese on top if you'd like extra yummy flavor.