How to Make It
Heat the oil in a large pot over medium-high heat. Add the onion, sausage, and 3/4 teaspoon salt. Cook, stirring occasionally, until the sausage is golden brown and the onion is tender, 6 to 8 minutes.
Add the broth, cover, and bring to a boil. Add the tortellini and simmer until tender, 4 to 6 minutes. Stir in the spinach.
Serve topped with the Parmesan.