Regular russet potatoes will work fine in this recipe if you are unable to find the Yukon Gold.
Prepare potatoes for roasting by peeling and cutting into large chunks.
Toss with oil.
Place in 425°F oven on lowest rack for best browning.
Roast for 40-45 minutes, turning at least once.
Mash potatoes in large bowl, leaving them slightly chunky.
Stir in buttermilk, butter, and chives.
Season with salt and pepper.