In a microwave-safe bowl add the onions, flour, basil, garlic, tomato paste and drizzle with olive oil. Microwave for 5 minutes, stirring every 90 seconds or so. (The mixture will be pasty and look weird but don’t worry it will all be okay in the end). Add the mixture to the slow cooker.

Add broth, tomatoes, chicken, salt and pepper to the slow cooker. Stir.

Cover and cook on LOW for 4-6 hours or on HIGH for 3-4 hours (or until chicken is very tender).

Remove the lid and remove the chicken out of the slow cooker. Add in tortellini and spinach, Parmesan cheese and warmed cream (cream should be warmed because it may cause curdling if added in cold).

On a cutting board, shred or cut the chicken into bite-size pieces. Add the chicken back into the slow cooker. Put the lid back on and cook on HIGH for about 10 more minutes, or until the tortellini are cooked through. Ladle into serving bowls and enjoy!