Pour mixture onto the turkey breast and vegetables.
Close the lid on the Instant Pot and turn the knob to sealing.
Press the "poultry" button or manual on high pressure. Set the cook time to 30 minutes.
After cooking "quick release" the pressure.
After releasing the pressure, remove the turkey breast from the Instant Pot and allow to rest.
Remove the cook vegetables and discard.
Remove the trivet and strain the buttery turkey broth that is in the bottom of the Instant Pot to remove any large clumps of vegetables or turkey pieces.
Put the turkey broth back into the Instant Pot. Add the gravy packet that came with the turkey. Stir to combine.
Set the Instant Pot to saute' and cook for 15-30 minutes or until reduced and thickend to your liking. Stir often as the gravy reduces and thickens.
Serve gravy on top of turkey breast and mashed potatoes if you'd like.