Peel and chop the russet potatoes into even chunks.
Place the potato chunks 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.
Reduce to a simmer and cook until fork-tender, about 15-20 minutes.
Drain the potatoes in a colander and return them to the pot.
Add the butter to the hot potatoes and allow it to melt.
Pour in the heavy cream gradually while mashing with a potato masher.
Season with salt and pepper to taste.
For extra creaminess, whip the potatoes with a hand mixer for a few seconds.