Peel potatoes and cut into pieces no larger than 1 inch by 1 inch. Place potatoes into a pot, add 1/2 teaspoon to the pot, add enough water to cover the potatoes. Cook potatoes on medium for about 15 minutes or until the potatoes are tender when pierced with a fork.
Drain potatoes, and place them back into the pot where they were cooked, add cream and butter. Beat with a blender until the potatoes are smooth. Season with salt and pepper.