Place the vegetables, bay leaf and parsley in the bottom of the pot. Then add chicken, salt and pepper.
Bring to pressure over high heat. Cook for 15 minutes. Let cool naturally for 5 minutes, then cool with water until pressure releases and remove lid. Let cool for 20 minutes.
Pour off broth. Remove chicken and set aside. Remove bay leaf. Cut vegetables, if desired. Return broth to vegetables. After chicken is completely cooled, pull apart into chunks and add to soup. Reheat and serve.