Scrub the potatoes. Prick each potato with a fork a couple times to allow the steam to escape when pressure cooking.
Pour water into the Instant Pot and place trivet, steamer basket, or foil balls in the bottom. Place clean potatoes on top, stacking if necessary.
Secure the lid in place and make sure the valve is set to SEALING.
Set to HIGH PRESSURE and add cook time (see below).
Small potatoes: Pressure cook for 10-12 minutes. Medium potatoes: Pressure cook for 14-16 minutes. Large potatoes (like you find at Costco): Pressure cook for 18-20 minutes.
When cook time ends, allow pot to naturally release pressure for 8-10 minutes. Do a quick release and remove potatoes with tongs.
Notes
Scrub your potatoes clean
Size matters...find potatoes equal in size for best results
Use a trivet so the potatoes aren't sitting in water
Err on the side of the larger potato, it's better to cook the potato more than less time!