Place the potatoes on top of the onions then add the chicken breast. Add the remaining ingredients and place the lid on the crock-pot. Turn on high and cook for 6-8 hours, the potatoes should be very soft and break apart as you mix.
Remove the chicken breast from the pot. Stir the soup vigorously to break up the potatoes and thicken the broth.
Shred the chicken using two forks to pull it into bite size pieces adding it back to the soup.
Serve warm topped with the fresh parsley. You can also add shredded cheese.