First, clean any debris from the potatoes and then bring a pot of water to boil. Add in the potatoes with the skin on and allow them to cook about 40 minutes or until easily pierced with a knife.
Now, when finished, drain the hot water and allow them to sit in cold water so that they are easier to handle.
Once cooled remove the skin. Then in a large bowl with a potato masher, mash the potatoes with the butter and heavy cream. You want some chunks because they are mashed and not whipped.
Next, add salt and black pepper to taste.
Note: If you do not measure out the potatoes adjust the heavy cream and butter to taste.