Add the chicken breasts to the slow cooker, along with onion, garlic, chicken broth, salt and pepper
Cook on low for 5 1/2 hours.
Remove the cooked chicken from the crock pot and shred, then back into the slow cooker.
In a bowl whisk the milk, heavy cream, SOFTENED cream cheese and flour.
Mix in with the chicken
Add the tortellini and spinach now.
Cook for 30 minutes until tortellini is cooked through and soup has thickened.
Serve and enjoy!