Instant Pot Greek Lemon Chicken Soup

olive oil (separated)

large chicken breasts (cubed into bite-size chunks)

medium onion (finely diced)

large celery stalks (diced)

garlic cloves (minced)

chicken broth

zest of one lemon

salt

fresh cracked black pepper

bay leaf

large egg (*see note)

juice of one lemon

salt and pepper (to taste)

fresh parsley, (to garnish (optional))