Peel the potatoes and cut them into large cubes.

Place them in the Instant Pot, cover them with 6 cups of water, and sprinkle in 2 teaspoons of salt.

Set the timer for 12 minutes. It will take about 30 minutes to come to pressure, then cook the potatoes for 12 minutes.

After the timer goes off, turn off the Instant Pot and, using a wooden spoon or other utensil, carefully release the valve. Make sure not to burn yourself. Keep releasing until the steam has subsided.

Open the lid and, using oven mitts, grab the container and drain the potatoes in a colander.

Return the potatoes to the container and add the remaining salt, pepper, butter, and slowly add the milk.

Using a potato masher, gently mash the potatoes until they reach your desired consistency. Do not over-mash, or they will get gummy.