Okay…you caught me. I mentioned this dish during my 2009 Thanksgiving post. But it is SO DELISH and EASY that I had to spotlight it again…and this time, on its own!
This Gratin is rich, earthy, and utterly satisfying—PERFECT for the holidays. And the best thing yet, you can make it days in advance and just pop it in the oven to warm up before serving. Nguyen-Win Situation! Kudos Bruce Aidells, this one is a keeper!
HAPPY THANKSGIVING ALL! Gobble-Gobble!
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Potato-Mushroom Gratin
From Bruce Aidells
Ingredients:
5 Tablespoons Olive Oil, divided
2½ Pounds Medium Yukon Gold Potatoes, peeled, cut lengthwise into 1/8-inch-thick slices
1½ Teaspoons Coarse Kosher Salt, plus additional for mushrooms
¾ Teaspoon Freshly Ground Black Pepper, plus additional for mushrooms
1¼ Cups Heavy Whipping Cream, divided
1 Cup Freshly Grated Parmesan Cheese (about 3 ounces), divided
2 Tablespoons Chopped Fresh Thyme
6 Garlic Cloves, thinly sliced
12 Ounces Fresh Crimini Mushrooms, sliced
Preheat 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.
theculinarychronicles.com 
what’s the rationale behind making these a day ahead? just curious in case i make them for the holidays. is it because you can cut them into individual servings or does it taste better reheated?
I don’t think the dish necessarily improves if you make it in advance—but it is one less thing you would need to make the day of a party 🙂