Prepare by placing a rack in the bottom of a 6-quart Instant Pot® and adding 3 cups of water. Neatly arrange the peeled potatoes on top of the rack.
Secure the lid of the Instant Pot® per manufacturer instructions and set it to pressure cook on high for 15 minutes.
After cooking, turn off the heat and allow the steam to release naturally for about 20 minutes. Carefully release any remaining steam and lift off the lid.
Move the cooked potatoes to a large mixing bowl. Then, incorporate the warmed half-and-half, butter, sour cream, along with a generous dash of salt and pepper.
Mash the ingredients together until you achieve the desired creaminess. Adjust seasoning with additional salt and pepper if needed.
These mashed potatoes pair wonderfully with roasted meats or your Thanksgiving feast. Enjoy!