Using a pair of tongs, remove the potato, one at a time, and place it in a potato ricer. Push the potato ricer into a bowl. Repeat until you’ve worked through all of the potatoes. Add the garlic cloves to the potato ricer and push those through, too.
Add the butter and heavy cream to a small saucepan and set over medium heat. Warm just until the butter has melted. To the potatoes, add the butter and heavy cream mixture, along with the sour cream and salt.
Mix together until combined. Give it a taste and adjust the salt according to your liking.
Garnish with melted butter and some fresh chives and lots of black pepper.