Heat a soup pot on the stove and grease with cooking oil.
Add ground Italian sausage. Brown sausage completely and break up into small pieces. Add in onions and garlic. Saute for 1 minute.
Pour in the can of diced tomatoes. Scrape bottom of pot to remove any brown bits stuck to the bottom.
Add in tomato paste, bouillon, water, and all of the seasonings. Stir completely. Bring to a simmer, cover with lid, and cook for 10 minutes.
Remove lid and place the tortellini in the pot. Press down until the pasta has been submerged under the liquid. Continue to simmer with lid on for 10 minutes. Ensure tortellini has been cooked thoroughly.
Add in the heavy cream and parmesan cheese. Stir. Add the baby spinach and stir completely. Take off heat and let sit for 2 minutes before serving.