Duchess Potato Casserole Cooks Illustrated Recipes

DUCHESS BAKED POTATOES

Steps:

• Place potatoes in a large pot and pour in water to cover by 2"; season with salt. Bring to a boil over medium-high. Reduce heat and simmer until a paring knife very easily slides through potatoes, 25-35 minutes. Drain and let cool slightly.
• Preheat oven to 425°F. Whisk egg yolks, garlic, cream, sour cream, butter, and peppercorns in a large bowl; season generously with salt. Peel potatoes and pass flesh through a ricer or a food mill (or mash them by hand if you don't mind a few lumps) directly into bowl with egg mixture. Fold in gently (be careful not to overmix). Transfer to a 3-quart baking dish and decoratively shingle or swirl surface. Bake, rotating once, until golden brown and slightly puffed, 30-40 minutes.
• Do Ahead
• Dish can be assembled 1 day ahead. Cover and chill. Increase bake time by 5-10 minutes.

CREAMY DUCHESS POTATOES

Steps:

• In pot, combine potatoes, garlic, 1 t salt and water to cover by 1 inch.
• Bring to a boil.
• Reduce heat to low; cook until tender, about 20 minutes; drain.
• Preheat oven to 375 degrees.
• Coat 1 1/2 quart shallow baking dish with cooking spray.
• Return potatoes and garlic to pot; mash.
• Stir in sour cream, butter, egg, Parmesan cheese, pepper, nutmeg and remaining salt until smooth.
• Spread 5 cups potatoes in baking dish.
• Place remaining potatoes in large pastry bag fitted with star tip; pipe rosettes over potatoes in dish.
• Bake 35 minutes or until lightly browned.
• If desired, garnish with chives.