In the crock of your slow cooker add the chicken, celery, carrots, onions, bay leaves, salt, pepper, water and bullion cubes if using them.
Cover and cook on low 7 hours or high 4 hours.
After that time, remove the chicken, pull it from the bone and and shred with two forks. Add the tortellini, thyme and parsley and cook until the tortellini are tender, about 20 minutes. Serve warm with rolls or crackers.
Notes
To freeze this soup: Set aside the portion you want to freeze before adding the tortellini. To reheat frozen soup: Add to a pot on the stove over medium low and stir often until thawed and simmering. Add tortellini and cook until tender: serve warm.