Set the Instant Pot trivet in the bottom of the Instant Pot insert.
Remove the turkey breast from the packaging and set the gravy packet aside.
1 7½-8 lb. whole turkey breast
Pat the turkey breast dry with paper towels.
In a small bowl, mix together butter, sage, thyme, rosemary, parsley, salt and pepper. Rub the butter mixture all over the outside of the turkey, under the skin, and inside the rib cavity.
6 tbsp butter, 2 tbsp fresh sage, 2 tbsp fresh thyme, 1 tbsp fresh rosemary, 2 tbsp fresh flat-leaf parsley, 1½ tsp kosher salt, 1 tsp freshly ground black pepper
Place the turkey, large cavity side up, in the Instant Pot. Pour the chicken broth inside and around the outside of the turkey. Scatter the chopped onion, carrots, and celery around the turkey. (*Note: the turkey can be stuffed with stuffing/dressing, but if not doing so, place some of the vegetables inside the cavity, too.)
1 large onion, 3 medium carrots, 2 medium celery stalks, 2 cups low-sodium or unsalted chicken broth
Set the Instant Pot lid in place and seal/lock the lid. Close the vent.
Cook on manual HIGH for 1 hour. Allow pressure to release naturally and wait for the pressure pin to drop before opening. This will take approximately 10 minutes.
Once the pressure pin has dropped, it is safe to open the Instant Pot.
Remove the turkey by lifting the Instant Pot trivet, set the turkey in a large bowl, and allow it to cool enough to handle. Reserve the turkey juices/drippings for making gravy. Your turkey breast should be cooked to 165°F. It will likely be in the 155-160°F range when you remove it from the cooker, but it will rise slightly while it rests.
When turkey has cooled enough, set the turkey on a cutting board, remove the meat from the bones and slice. Transfer sliced turkey to a serving platter. Serve immediately. Enjoy!