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Potato-Mushroom Pie


This gratin combines two comforting ingredients to their mutual advantage -- and ours. Sliced potatoes encircle a casserole dish, with assorted wild mushrooms, such as chanterelle and oyster, taking spots alongside more potatoes. Fresh thyme gives the pie herbal undertones; Gruyere and Parmesan, melting in and around the layers during baking, make it soul-satisfying.

  • Servings: 12
potato mushroom pie

Photography: Gentl and Hyers

Source: Martha Stewart Living, November 2006


  • 2 tablespoons unsalted butter, plus more for dish
  • 1 medium onion, cut into 1/2-inch dice
  • 2 pounds assorted wild mushrooms, such as chanterelle, oyster, or black trumpet, coarsely chopped
  • 1/4 cup dry white wine, such as Sauvignon Blanc
  • 1 1/2 teaspoons coarse salt
  • Freshly ground pepper
  • 1 cup finely grated Gruyere cheese (about 4 ounces)
  • 1 cup finely grated Parmesan cheese, about 3 1/2 ounces
  • 2 pounds Yukon Gold potatoes, peeled and cut into 1/8-inch-thick rounds
  • 1 tablespoon finely chopped thyme leaves
  • 3/4 cup whole milk
  • 1/2 cup heavy cream


  1. Preheat oven to 350 degrees. Butter a 13-by-9-inch baking dish; set aside. Melt butter in a large skillet over medium heat. Add onion; cook, stirring occasionally, until softened, about 5 minutes. Add half of the mushrooms; cook until they are slightly softened. Add remaining mushrooms; cook, stirring occasionally, until mushrooms have released their juices and most of the liquid has evaporated, 8 to 10 minutes. Add wine; cook, stirring occasionally, until liquid has evaporated, 3 to 5 minutes. Remove from heat. Season with salt and pepper.

  2. Combine cheeses in a small bowl; set aside. Cover bottom of prepared dish with potato slices, slightly overlapping them. Sprinkle with half of the thyme and a pinch each of salt and pepper. Sprinkle with 1/3 of the cheese and half of the mushroom mixture. Repeat layering process, using all but 2 tablespoons cheese. Arrange remaining potato slices, slightly overlapping, around the edge of the dish. Stir together milk and cream in a bowl, and pour over top. At this point, dish can be refrigerated, covered, up to 1 day; let stand at room temperature 30 minutes before baking.

  3. Cover loosely with foil, and bake until bubbling, about 1 hour. Remove foil, and sprinkle with reserved cheese. Bake until top is golden, 20 to 30 minutes more. Transfer dish to a wire rack; let cool 10 minutes before serving.

Cook's Notes

Use a mandoline to make thin, even potato slices.

Reviews Add a comment

  • lettesco40
    2 MAR, 2016
    it tasted good but the sauce separated and looked curdled I wouln't want to serve it a party like this, anyone know where I went wrong? maybe the mushrooms weren't dry enough?
  • AfterWorkCook
    17 DEC, 2013
    Question: I am hoping to take this to a Christmas party. Can I cook it at home for the hour, and then the rest of the 30min to golden the cheese after I arrive at my holiday location (about 2hrs later)?
  • arabela
    14 NOV, 2011
    Jidiji - I've made this two or three times, and yes, it does take the full time stated to cook. I was also sceptical about the cooking time before I'd tried it, seeing as the mandoline slices the potato so thinly, however, it really wasn't done until it had the full time. It's absolutely decicious!
  • purr1358
    20 NOV, 2008
    Do you have to use Yukon Gold potatoes? Would Russet work just as well?
  • jidiji
    14 NOV, 2008
    Does this recipe REALLY take 1 1/2 hrs. total to bake???? If you're slicing the potatoes on a mandoline, what is it exactly that takes 1 1/2 to cook?
  • sasscancook
    13 NOV, 2008
    alibee, a mandoline is a slicer that is usually used on an angle. It is very sharp and helps to assist in getting more uniform slices versus you slicing by hand. You can find them at BB
  • alibee5
    13 NOV, 2008
    What's a mandoline?
  • sewforyou
    26 JUN, 2008
    This is so delicious ! If the grocery doesn't have exact mushrooms I make it with Portabellos and it's very good. It looks special and your family and friends will love the extra mile you went.
  • Regan
    3 DEC, 2007
    You're right, the Gruyere cheese was accidentally omitted from the ingredients list. The error has been fixed. Thank you!
  • Gumby
    21 NOV, 2007
    Potato-Mushroom Pie: I have the original recipe from Martha Stewart Living magazine and it calls for "1 cup finely grated Gruyere cheese (about 4 ounces)". Everything else is the same. I think they just left this out by mistake.