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Slow-Cooked Potatoes with Mushrooms and Ham

Slow-Cooked Potatoes with Mushrooms and Ham

If you’re looking for a casserole to die for, it’s right here! Potatoes slow-cooked with cheese and soaked in cream. It doesn’t get any better than this.

  • Prep Time: 30 minutes
  • Total Time: 5 hours
  • Yield: 8 servings


  • 4 tablespoons (½ stick) unsalted butter
  • 1 cup chopped yellow onion (about 1 medium onion)
  • 1 pound button or shiitake mushrooms, or a mix of your favorite mushrooms, wiped clean, stemmed, and sliced
  • 1 tablespoon chopped garlic (2 to 3 cloves)
  • 1½ teapoons salt
  • 1½ teaspoons freshly ground black pepper
  • 4 pounds Idaho potatoes, peeled and submerged in a bowl of water
  • 8 ounces thinly sliced Black Forest ham
  • 4 ounces Gruyère cheese, grated
  • 1 cup homemade chicken stock or packaged low-sodium chicken broth
  • 3 sprigs fresh thyme, plus 1 tablespoon fresh thyme leaves
  • 1 cup heavy cream


  • Melt the butter in a 12-inch skillet over medium-high heat. Add the onion and cook for 1 minute. Add the mushrooms, raise the heat to high, and continue cooking, stirring as needed, for 5 minutes. Add the garlic, ½ teaspoon of the salt, and ½ teaspoon of the pepper. Remove from the heat and set aside.

  • Generously coat a 6-quart slow cooker with cooking spray. Slice half of the potatoes into 1/8-inch-thick slices on a mandoline. Shingle the potatoes in two layers in the slow cooker, and season them with ½ teaspoon of the salt and ½ teaspoon of the pepper. Top the potatoes with half of the mushroom-onion mixture and gently spread it out in an even layer.

  • Arrange half of the ham slices over the potatoes, top with half of the Gruyère, and pour in half of the chicken stock. Repeat with the remaining potatoes, salt, pepper, mushroom mixture, and ham. Add the remaining ½ cup chicken stock. Using a metal spatula, gently press the ingredients so the layers are even. Tuck the thyme sprigs around the edges.

  • Cook on high for 4 hours, or until the potatoes are tender. You can test for doneness by inserting the blade of a thin knife into the center. There should be little resistance.

  • Drizzle in the heavy cream and cook for another 30 minutes.

  • When the casserole is done, top it with the remaining Gruyere and the fresh thyme leaves. Turn off the cooker. Allow the potatoes to cool enough to set before serving, about 1 hour, covered.

Recipe Details