Wash, peel, and slice potatoes.
Place the potato slices into the bottom of the instant pot bowl.
Add enough water to cover the potatoes.
Add 1 teaspoon of salt.
Place the lid on the instant pot to seal it closed.
Cook on manual high for 8 minutes.
When the timer goes off, let the pressure release naturally, on its own, for 3 minutes.
Drain the potatoes and return them to the instant pot.
Add the remaining salt, pepper, whipped cream cheese, and butter.
Mash until smooth.
Add 1/4 - 1/3 cup of warm milk (20-30 seconds in the microwave) if the potatoes are too stiff.
Taste and add more salt if needed.