Sauté onion, celery in Instant Pot. Add chicken stock, place turkey on trivet, seal vent. Cook high pressure (6 mins/pound).
Instant Pot takes 10 mins to pressurize. After cooking, natural release 15 mins. Optional: Broil turkey 1-2 mins for color.
Let turkey sit 10 mins. Carve it. Serve with mashed potatoes, gravy, sweet potatoes, veggies. Enjoy your Instant Pot turkey breast!