medium Yukon Gold
, peeled and quartered
Boil potatoes in a medium saucepan over medium-high for 10 min, then add carrots. Continue boiling until carrots are tender and potatoes are very tender, 10 to 15 more min (remove carrots before potatoes are done). Drain. Slice carrots diagonally into coins. Mash potatoes with sour cream, butter and salt. Season with pepper. Transfer potatoes and carrots to plates.