Ingredients

  • 5 ounces stilton blue cheese, crumbled, room temperature (about 1 1 /2 cups)
  • 2 cups half-and-half
  • 1 teaspoon salt
  • 12 teaspoon pepper
  • 1 12 tablespoons butter
  • 2 tablespoons sherry wine
  • 1 shallot, diced
  • 2 garlic cloves, minced
  • 1 lb mixed fresh wild mushroom, thickly sliced (such as chanterelle, morel, portobello, stemmed shiitake, oyster, crimini or hedgehog)
  • 1 12 teaspoons chopped fresh thyme or 34 teaspoon dried thyme
  • 2 lbs yukon gold potatoes, peeled, very thinly sliced into rounds

Method

  • Position rack in top third of oven and preheat to 400F Butter 13 x 9 x 2-inch glass baking dish.
  • Place cheese in medium bowl; add 1/2 cup half and half.
  • Using fork, mash mixture to chunky paste.
  • Mix in 1 teaspoon salt and 1/2 teaspoon pepper.
  • Mix in remaining 1 1/2 cups half and half.
  • Melt butter in heavy large pot over medium-high heat.
  • Add mushrooms, sherry, shallot, garlic and herbs; saute until mushrooms, garlic and shallot are tender and liquid cooks away, about 8 minutes.
  • (Cheese sauce and mushrooms can be made 8 hours ahead.
  • Cover separately and chill.
  • ).
  • Arrange half of potatoes on bottom of prepared dish.
  • Spoon 3/4 cup cheese sauce evenly over.
  • Top with all of mushroom mixture, 3/4 cup cheese sauce, then remaining potatoes.
  • Top with remaining cheese sauce.
  • Cover dish with foil.
  • Bake gratin 30 minutes.
  • Uncover and bake until potatoes are tender, top is golden brown and sauce is thickened, about 30 to 40 minutes longer.
  • Let stand 10 minutes; serve hot.