Prick each one 5-6 times with a fork. Place the trivet in your Instant Pot. Pour in 1 cup cold water. Then place potatoes on top, stacking on top of each other if necessary. 

Place lid on and make sure valve is in sealed position. Cook on HIGH pressure for 12 minutes. Allow pressure to release naturally for 8-10 minutes. Then release any remaining pressure using quick release.

Preheat oven to broil.

Remove the cooked potatoes and place on a baking sheet. Brush all over skins with olive oil.

Sprinkle all over sides of potatoes with kosher salt.

Place baking sheet on MIDDLE rack of the oven. Broil for 1-2 minutes, turn potatoes over, and broil for 1-2 minutes longer. Serves 6.