Cut up enough chicken to make 4 cups of diced cooked chicken.
Rinse chickpeas very well in colander, until no more foam appears.
Chop the onion, and finely chop the oregano.
Put all ingredients except parsley into crockpot, cover, and cook on low 8-10 hours.
Just before you’re ready to serve the soup, finely chop the fresh parsley and crumble the Feta.
Add half the parsley to the soup and cook a few more minutes.
Serve hot, with additional chopped parsley and crumbled Feta to add at the table if desired.