Wash and dice potatoes. Leave the skins on.

Add potatoes to the Instant Pot. Add one cup of water.

Place the lid on the Instant Pot, and set the valve to the sealed position. Press “pressure cook” or manual button, and set the time to five minutes. Once the Instant Pot stops cooking, release the pressure, and remove the lid.

Transfer the potatoes to a mixing bowl. Add in margarine or butter, salt, and pepper. Mix well with hand mixer until smooth.