Duchess Gratin Potato Slab

Duchess Gratin Potato Slab

Prep Time

30 minutes

Cook Time

35 minutes


4 people

Golden, cheesy, and with that hint of ham, this Duchess Gratin Potato Slab is a great addition to your dinner table.

The flavor of loaded potatoes, the texture of classic Duchess spuds and the look of slab pie. Did I mention it’s easy as well? Using leftover mashed potatoes is also perfectly suitable for this preparation!


  • Nonstick cooking spray
  • 3 egg whites, room temperature
  • 3 cups Yukon gold potatoes, cooked, mashed and cooled
  • Melted butter, to taste
  • Salt and pepper, to taste
  • 1 teaspoon garlic powder
  • 1/2 cup milk
  • 2 ounces capitol ham, sliced thin
  • 4 thick slices provolone cheese
  • 1 cup fresh bread crumbs


  • 1 Spray an 8-inch pan with nonstick cooking spray; set aside. Preheat oven to 350-degrees F.
  • 2 In large mixing bowl, beat egg whites until stiff peaks form using an electric mixer; set aside.
  • 3 In another large bowl, add potatoes, butter, salt and pepper to taste, garlic powder and milk.
  • 4 With an electric mixer, beat until as smooth as possible. Fold the beaten egg whites into the potato mixture until fully incorporated.
  • 5 Spread half the potato mixture into prepared pan. Lay the ham on top, followed by cheese.
  • 6 Sprinkle bread crumbs over everything and bake 35-40 minutes, or until topping is crisp and just starting to brown.
  • 7 Remove from oven to serve immediately.



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