Prep Potatoes: wash the outside of 4 pounds russet potatoes with cold water and pat dry with paper towel. Use a vegetable peeler to peel off the potato skin and then cut potatoes into large chunks.
Boil: bring a large pot of water to a boil, add chunks of potatoes, and let them boil for 10-15 minutes or until easily pierced with a fork. Time will vary depending on their size.
Potato Ricer: drain the cooked potatoes and run them through a potato ricer.
Combine: transfer potatoes to a large bowl and add 1/4 cup heavy cream, 1/2 cup butter, 1/2 cup + 2 tablespoons sour cream, 1 1/2 teaspoon garlic powder, 2 1/2 teaspoons kosher salt and 1/8 teaspoon ground black pepper. Mix to fully combine. Taste and add any additional salt, butter, etc - as desired. Add additional splashes of cream to reach desired consistency.
Serve: Enjoy immediately!
Notes
Potatoes: love a classic russet potatoes for a mashed potato recipe, but feel free to sub with Yukon Gold Potatoes!