Rub the turkey with butter then sprinkle it with the salt and pepper. Place the trivet in the bottom of the instant pot and add the broth, onion, carrots, celery, garlic, and herbs.
Place the turkey on top of the veggies. Put the lid on the instant pot and select high pressure for 60 minutes.
When it is done cooking, allow the pressure to release naturally for about 5 minutes then manually release the rest of the pressure.
The turkey skin will not brown in the pressure cooker. If you want crispy brown skin then turn the oven broiler on high. Set the turkey under the broiler for 3 to 5 minutes until the skin is brown.
Notes
If your turkey breast has a gravy packet then run the breast under cold water to loosen the opening of the breast enough to remove the gravy packet.
When the pressure is released from the instant pot, check the internal temperature of the turkey with a meat thermometer. It should read at least 165°F. If it is lower than that then replace the lid and cook under high pressure for 5 to 10 more minutes.
If you have a different sized turkey breast adjust the cooking time accordingly. It will take 12 minutes per pound to cook your frozen turkey breast.
If your turkey is already thawed it will only need to cook for 6 minutes per pound.
Cooking Times for High Elevations
The following cooking times are for a 4-1/2 pound frozen turkey if you live at a higher elevation.