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Elegant Duchess Potato Casserole Recipe

Close-up of a baked duchess potato casserole with perfectly piped, golden-brown peaks of mashed potato topping.
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Create a comforting and elegant Duchess Potato Casserole, featuring creamy mashed potatoes topped with a beautiful, golden-brown swirl finish, perfect for your next special dinner.

Ingredients

Scale
  • 3 lbs Russet potatoes, peeled and quartered
  • 1 cup whole milk
  • 8 tablespoons unsalted butter, cut into pieces
  • 1 teaspoon salt
  • 1/2 teaspoon black pepper
  • 1/4 teaspoon nutmeg
  • 4 large egg yolks, lightly beaten
  • 1/2 cup grated Parmesan cheese (optional, for layering)
  • 1 large egg, beaten (for egg wash)

Instructions

  1. Preheat your oven to 400 degrees Fahrenheit. Lightly grease a 9×13 inch baking dish.
  2. Place the peeled and quartered potatoes in a large pot and cover them with cold, salted water. Bring to a boil and cook until the potatoes are very tender, about 15 to 20 minutes.
  3. Drain the potatoes completely. Return them to the hot, empty pot over low heat for one minute, stirring constantly to dry them out slightly. Remove from heat.
  4. Add the milk and butter to the potatoes. Mash until smooth. Stir in the salt, pepper, and nutmeg until fully combined.
  5. Let the mashed potatoes cool slightly, about 10 minutes. Once slightly cooled, beat in the four egg yolks one at a time until the mixture is smooth and creamy. This is your Duchess potato base.
  6. If you are adding cheese, spread half of the grated Parmesan evenly over the bottom of the prepared baking dish. Spoon the potato mixture over the cheese layer and spread it evenly. Sprinkle the remaining Parmesan over the top of the potatoes.
  7. Transfer the potato mixture to a large piping bag fitted with a large star tip (like an open star tip). Pipe decorative swirls or mounds over the entire surface of the potato casserole. You can also use a fork to create decorative peaks if you prefer not to pipe.
  8. Brush the piped potato topping lightly with the beaten egg wash for extra browning.
  9. Bake for 20 to 25 minutes, or until the topping is golden brown and the casserole is heated through. Let it rest for 5 minutes before serving.

Notes

  • For a richer flavor, substitute heavy cream for half of the milk.
  • If you do not have a piping bag, you can use a large zip-top bag and snip off a corner to create a makeshift piping tool.
  • You can prepare the mashed potato mixture up to one day ahead and store it covered in the refrigerator. Add 5-10 minutes to the baking time if baking cold.
  • Adding a pinch of cayenne pepper to the mash gives a subtle warmth to this classic potato side dish for dinner.

Nutrition

Find it online: https://blissbatter.com/duchess-potato-casserole-recipe/