Au Gratin Mashed Potatoes

1. 1

   Thinly slice potatoes on a mandoline and place in a large pot with milk, cream, and salt. Heat mixture until it boils over medium-high; boil, stirring frequently to prevent scorching, until potatoes are tender and nearly all liquid evaporates, about 30 minutes. Crush potatoes with a masher to desired consistency.

2. 2

   Preheat broiler to high with rack 6 inches from element. Transfer mashed potatoes to a broiler-safe, 11/2-qt. bowl or dish.

3. 3

   Combine Parmesan, chives, and pepper; sprinkle over potatoes. Broil potatoes until Parmesan melts and browns, about 5 minutes.

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