Boil the potatoes. Bring a large pot of water to a boil. Add 2 teaspoons of salt to the water and then slowly add in your washed potatoes with the skin still on. Boil the potatoes for 15-20 minutes, or until fork tender. Remove the potatoes from the water and place them in a large mixing bowl.
Preheat. Preheat your smoker to 225 degrees F with a mild hardwood like pecan or alder.
Mash. Using electric beaters or a potato masher, mash the potatoes until they are about 75% broken down. Add in the butter, cream cheese, and heavy cream. Mix again until they reach your desired consistency. Don't over-whip. Add salt to taste.
Smoke. Spread the mashed potatoes into a 12-inch cast iron skillet. Place the skillet in the smoker and close the lid. Smoke for 1 hour.
Enjoy. Serve warm with additional melted butter, if desired.
