Boil peeled potatoes in 6 quarts of water then reduce heat tor med-low for 20-30 min until tender.
Drain and transfer to a 350°F/175C oven to dry for 10-15 min.
Mash the dried potatoes with butter & salt until smooth.
Add heavy cream and mix.
Press mashed potatoes through a fine mesh strainer for a silky purée. I typically use a small ladle to push them through.
Adjust with more cream and salt if needed, ensuring potatoes remain slightly loose.