Potato-Mushroom Gratin

4.3(28)

Luscious and satisfyinga little goes a long way. Make the gratin up to one day ahead. Before serving, cut it into pieces and rewarm in the oven.

by Bruce Aidells·published 2008-11-03

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Servings

Makes 10 servings

Total time

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Calories / serving

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Ingredients (9)

serves

5 tablespoons olive oil, dividedolive-oil
2 1/2 pounds medium Yukon Gold potatoes, peeled, cut lengthwise into 1/8-inch-thick slicespotato
1 1/2 teaspoons coarse kosher salt plus additional for mushroomsmushroom
3/4 teaspoon freshly ground black pepper plus additional for mushroomsmushroom
1 1/4 cups (or more) heavy whipping cream, dividedheavy-cream
1 cup freshly grated Parmesan cheese (about 3 ounces), dividedparmesan
2 tablespoons chopped fresh thymethyme
6 garlic cloves, thinly slicedgarlic
12 ounces fresh crimini (baby bella) mushrooms, slicedmushroom

Instructions (2 steps)

01Preheat oven to 375°F. Brush 13x9x2-inch glass or oval ceramic baking dish with 2 tablespoons oil. Arrange 1/3 of potatoes, slightly overlapping, in dish. Sprinkle with 1/2 teaspoon coarse salt and 1/4 teaspoon pepper. Pour 1/3 cup cream over; sprinkle with 1/4 cup cheese. Repeat layering 1/3 of potatoes, 1/2 teaspoon salt, 1/4 teaspoon pepper, 1/3 cup cream, and 1/4 cup cheese 2 more times. Bake uncovered until potatoes are tender, adding cream by tablespoonfuls if dry, about 45 minutes. Remove from oven; maintain oven temperature.

Sprinkle thyme and garlic slices over gratin. Toss mushrooms in medium bowl with 3 tablespoons oil; sprinkle with coarse salt and pepper. Arrange mushroom slices atop gratin around edge of dish. Drizzle with 1/4 cup cream; sprinkle with 1/4 cup cheese. Continue to bake uncovered until mushrooms are tender and potato edges are golden brown, about 20 minutes longer. DO AHEAD: Can be made 1 day ahead. Cool 1 hour in dish; cover and chill. Before serving, cut gratin into 10 pieces. Transfer to rimmed baking sheet. Cover with foil and rewarm in 350°F oven, 10 to 15 minutes.

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