Season turkey breast all over with salt. See How To Brine Turkey for the brine recipe. Combine softened butter, minced garlic, sage, rosemary, thyme, paprika, and parsley. You can also melt the butter before adding the ingredients and brush them on the turkey breast.
Generously rub the turkey breast with the herbed butter. This step can be done the day before cooking it.
Let it marinate in the fridge until ready to use. You can make the herbed butter a day or so in advance if desired.
In a 6- or 8-quart Instant Pot, press the saute function.
Once hot, add oil and saute the chopped onion and celery.
Pour in chicken stock and stir, making sure to scrape the bottom of the pot to remove any stuck pieces.
Place turkey breast inside on the trivet and close the lid with the vent set to sealing.
Cook on manual high pressure for 20-35 minutes (6 minutes per pound) until an instant-read thermometer inserted into the thickest part of the turkey reads 165℉/74℃. The Instant Pot will take about 10 minutes to come under pressure, and the timer starts after this.
When your cooking time is up, let the Instant Pot Pressure release naturally for 15 minutes, then turn the knob to vent to release any remaining pressure.
Optional: If you want the turkey to look like in the photos, low broil it for 1-2 minutes. Do not take your eyes off it because it burns easily.
Let the turkey breast sit for 10 minutes before carving so the juices settle back into the meat.
Serve with mashed potatoes and gravy, mashed sweet potatoes, or vegetables. Enjoy!