Scrub, peel and cut the potatoes into quarters and then 2” pieces. Place the cut potatoes in a large pot. Cover the potatoes with cold water and add 2 tablespoons of kosher salt.
While the potatoes are cooking, in a small saucepan, over medium low heat, add the butter. Once the butter has melted, add the garlic and sauté for 1 minute.
Add the heavy cream to the same saucepan and bring to a gentle simmer. Next, add the sour cream and 2 teaspoons of kosher salt. Whisk until the mixture is smooth, then remove the pot from the heat.
Top with chives, freshly ground black pepper, and a pat of butter if you like. Serve immediately or transfer to an air tight container once cooled and store in the refrigerator for up to 3 days.