Place potatoes into a medium saucepan, cover with cold water, add salt, bring to the boil and simmer until the potatoes are tender.
Drain, return the potatoes to the warm pot, place over low heat and allow the potatoes to steam dry.
Mash potatoes thoroughly with a masher or pass through a mouli or potato ricer. Stir through milk, butter and parmesan and season to taste with smoked salt.