Heat a large pot or Dutch oven over medium-high heat.
Add the Italian sausage and cook, breaking it apart with a spoon, until browned and cooked through. Drain excess grease if needed.
Add the butter, melt, and then add the vegetables. Season with salt and pepper.
Cook for 5–7 minutes, stirring occasionally, until the vegetables begin to soften. Stir in the garlic and cook for another 30 seconds until fragrant.
Stir in the garlic and Italian seasoning and cook for a minute.
Pour in the chicken broth and bring to a simmer.
Add the cheese tortellini and spinach to the pot and reduce the heat to a simmer.
Cook according to package directions, usually about 5–7 minutes, until the pasta is tender.
Add the cream and flour to a mason jar, cover with a lid, and shake to combine.
Stir in the cream and let it simmer for a few minutes for the soup to thicken.
Serve topped with Parmesan cheese.
Enjoy!