Set the Instant Pot to sauté mode and add olive oil.
Once hot, add chopped onion, celery, and carrots. Sauté for 3–4 minutes.
Add minced garlic, salt, pepper, and turmeric. Cook for 1 minute.
Add chicken broth and chicken. Close the lid and seal the valve.
Cook on high pressure for 10 minutes. Let the pressure release naturally for 10 minutes, then quick release the rest.
Remove chicken, shred it with two forks, then return it to the pot.
Add zucchini and yellow squash. Use sauté mode to simmer for 5–8 minutes until tender.
Stir in chopped parsley and serve warm.