Peel and chop the potatoes into even chunks.
Place the potatoes in a large pot and cover with cold water.
Add a pinch of salt to the water.
Bring the water to a boil over medium-high heat.
Cook the potatoes until they are fork-tender, about 15-20 minutes.
Drain the potatoes and return them to the pot.
In a saucepan, heat the heavy cream and butter until melted.
Pour the cream mixture over the potatoes.
Use a potato masher or ricer to mash the potatoes until smooth.
Season with salt and pepper to taste, mixing well.