Sauté Onion: Turn on 'Sauté' and adjust the heat level to 'Normal'. Allow the pot to heat up until the display reads 'Hot'. Add the olive oil and let it heat up. Add the chopped onions to the pot and toss until thoroughly coated in the oil. Sauté, tossing occasionally, until the onions become soft and translucent. About 2 to 3 minutes.
Add Garlic, Celery & Seasonings: Add the minced garlic and cook for another minute. Continue to stir. Add the chopped celery, turmeric, Italian seasoning, pepper, and salt. Mix all the ingredients well and let sauté for an additional 1 to 2 minutes. Turn off 'Sauté' and deglaze the bottom of the pot.
Add Chicken, Vegetables & Stock: Place the whole chicken, breast side up, into the Instant Pot. Then, add the carrots and baby red potatoes. Now pour the chicken stock into the pot.
Set Cook Time: Close the Instant Pot, adjust the pressure release valve to 'Sealing' and select the 'Soup' function. The Instant Pot will cook at high pressure for 30 minutes.
FULL NPR: Once the cooking time has completed, allow for a Full Natural Pressure Release which can range from 30 to 50 minutes. If you are in a hurry, you can release any remaining pressure at 30 minutes if you wish. After the NPR has finished and the pin has fallen, open the pot.
Shred Chicken: Carefully remove the whole chicken from the Instant Pot and place in a bowl and shred. Add the shredded chicken back to your soup.