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white casserole dish filled with golden brown swirls of mashed potatoes

Easy Duchess Potatoes Casserole Recipe

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  • Author: Christina
  • Total Time: 45 minutes
  • Yield: 6-8 1x



2 1/2 pounds Yukon Gold potatoes

1/3 cup heavy cream

4 tablespoons salted butter, divided

1/2 teaspoon black pepper

1/4 teaspoon white pepper

2 teaspoons coarse kosher salt

Pinch nutmeg

3 egg yolks


  1. Peel and cut potatoes into equal pieces. Place potatoes in a large pot of salted water and boil until tender (12-18 minutes, depending on the size of your potato pieces). Drain potatoes, then return to the pot over low heat for several minutes, letting any residual moisture evaporate without browning the potatoes. Using a potato ricer or food mill, process the hot potatoes into a large bowl until smooth. If you don't have either mashing tool, use a regular potato masher or a couple of forks to make the potato mixture as smooth as possible. 
  2. To the hot potatoes add 2 1/2 tablespoons of butter, 1/3 cup heavy cream, black and white pepper, coarse salt and a pinch of nutmeg. Stir well to combine. Taste and adjust seasoning. When the potatoes have cooled a bit, mix in three egg yolks until the egg mixture is equally distributed into the potatoes, creating a light yellow mixture.
  3. Spread about half of the potato mixture into the bottom of a greased 2-quart casserole dish. Use a rubber spatula or offset spatula to smooth the layer. Transfer remaining potato mixture to a piping bag fitted with a large star piping tip. Pipe potatoes in 2-3 inch large swirls across the top of the casserole. Refrigerate piped potato casserole, uncovered, for 30 minutes. Now, preheat oven to 400℉. Once cooled, gently brush the top of the potato swirl surface with melted butter, then bake for 30 mins, until golden brown and heated through. (For an extra-brown surface, broil potato casserole for the final few minutes).
  4. Remove from oven and serve.


To make Duchess Potatoes Casserole ahead, complete steps 1-3, but before baking, cover and refrigerate. When ready to bake, preheat oven to 400℉. Brush the piped potato topping with melted butter, then bake according to recipe instructions. 

To make Duchess Potatoes Casserole without a piping bag, use a zip top bag with a 1/2 inch hole cut in the corner to pip potatoes onto the dish. Or simply spread your prepared potatoes in the casserole dish and use the tines of a fork to create a grid pattern in the top of the potatoes (similar to the top of the mashed potatoes in our Creamy Fish Pie Recipe). Brush with butter, then bake.

  • Prep Time: 15
  • Cook Time: 30
  • Category: Easy Recipes
  • Method: Bake
  • Cuisine: American