Close and lock the lid of the Instant Pot. Press MANUAL and then use the
+ (PLUS) or - (MINUS) button to choose 20 minutes pressure cooking time.
When time is up, open the cooker using QPR.
Transfer potatoes to mixing bowl, reserving the cooking water. Remove
the skins while they are still hot.
Add 2 tablespoons of the cooking liquid and 2 tablespoons half-and-half
and begin mashing with a potato masher. Continue adding small quantities of
the cooking liquid and half-and-half until the desired consistency is