Place the unpeeled potatoes in a pot and cover them with cold water by about an inch.
Bring the water to a gentle boil, add salt, and cook for about 30-35 minutes until tender and easily pierced with a toothpick.
Heat the cream in a small saucepan on medium-low until warm, stirring occasionally, about 5 minutes. Remove from the heat and set aside.
Drain the potatoes and cut them in half.
While the potatoes are still hot, carefully pass the potato halves, cut side down, through a potato ricer, collecting the riced potato in a mixing bowl. Remove the skins from the ricer occasionally to prevent clogging. Alternatively, cool the potatoes slightly, peel with a paring knife, and mash in a bowl with a potato masher.
Gradually pour the warm cream into the bowl while whisking well until the mixture is smooth and lump-free.
Add the nutmeg and salt and whisk until evenly combined.
Taste and adjust for salt and nutmeg, and serve hot.