Put all ingredients, except the tortellini, into a crock pot. Cook on low for 6-8 hours. You can also cook on the stove in a large soup pot for 1-2 hours on medium heat.
Add tortellini at least 30 minutes prior to eating but no more than 1 hour. If you want to make it dairy free omit the cheese tortellini and opt for shell pasta
Serve with grated Romano or Parmesan if desired.