Classic mashed potatoes get a sweet parsnip topping for a twist on a traditional side dish.
Place the potato slices in a large saucepan, cover with water, and bring to a boil over high heat. Reduce heat to medium high, and cook until tender, 25 to 30 minutes. Drain potatoes in a colander.
In a small saucepan, heat the milk and butter until just boiling.
Transfer the potatoes to bowl of an electric mixer fitted with whisk attachment, and mix on low speed until potatoes are smooth. Add the hot-milk mixture, sour cream, salt, and pepper, and mix, increasing speed to high as milk is combined, until the potatoes are fluffy. Serve garnished with the Caramelized Roasted Parsnips.