Let’s get cooking! Follow these steps to bring this comforting dish to life:

1. Heat the olive oil in a large pot over medium heat. Add the Italian sausage and cook until browned, breaking it up with a spoon as you go, about 5-7 minutes.
2. Stir in the diced onion and garlic. Cook until the onion is translucent, about 3 minutes, stirring occasionally to prevent sticking.
3. Add the chicken broth, diced tomatoes (with their juices), Italian seasoning, salt, and pepper. Bring the mixture to a gentle boil.
4. Reduce the heat to a simmer and stir in the tortellini. Cook according to package instructions, usually about 5-7 minutes.
5. In the last two minutes of cooking, add the spinach. It will wilt beautifully into the soup, adding a pop of color and nutrition.
6. Remove the pot from heat and sprinkle with Parmesan cheese before serving.

Pro tip from my kitchen: If you like a thicker soup, let it simmer a bit longer to reduce the broth. This is one of those recipes where you can really make it your own.