Classic Duchess Potatoes

Name: Classic Duchess Potatoes
Prep time: 37 min
Cook time: 43 min
Total time: 1 h 20 min
Yield: 8 servings
Cuisine: French
Ingredients: 3 lb (1360 g) Russet or Yukon Gold potatoes, peeled and cut into 2-inch (5 cm) chunks; 1 tbsp (15 g) kosher salt, for the cooking water; 4 tbsp (57 g) unsalted butter, cut into small pieces; ¼ cup (60 ml) heavy cream, at room temperature; 3 whole (54 g) large egg yolks, at room temperature, lightly beaten; ¼ tsp (½ g) nutmeg, freshly grated; 1 tsp (6 g) fine salt, plus more to taste; ¼ tsp (½ g) white or black pepper, freshly ground; 1 whole (18 g) large egg yolk, at room temperature; 1 tbsp (15 ml) heavy cream or milk; 1 tbsp (14 g) unsalted butter, melted, for brushing the parchment; 1 tbsp (4 g) fresh parsley or chives, finely chopped, for garnish (optional)

From the MyKitchenBank Kitchen

Fluffy mashed potatoes enriched with egg yolks, butter, cream and a little nutmeg, piped into elegant rosettes and baked until the ridges are deep golden and crisp and the centers stay tender and creamy.

Prep: 37 min
Cook: 43 min
Wait: 8 min
Total: 1 hr 28 min
Makes: About 16 rosettes (8 servings of 2)

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Ingredients

8 servings

For the potatoes
3 lb (1360 g) Russet or Yukon Gold potatoes, peeled and cut into 2-inch (5 cm) chunks
1 tbsp (15 g) kosher salt, for the cooking water
4 tbsp (57 g) unsalted butter, cut into small pieces
¼ cup (60 ml) heavy cream, at room temperature
3 whole (54 g) large egg yolks, at room temperature, lightly beaten
¼ tsp (0.5 g) nutmeg, freshly grated
1 tsp (6 g) fine salt, plus more to taste
¼ tsp (0.5 g) white or black pepper, freshly ground
For the egg wash and pan
1 whole (18 g) large egg yolk, at room temperature
1 tbsp (15 ml) heavy cream or milk
1 tbsp (14 g) unsalted butter, melted, for brushing the parchment
1 tbsp (4 g) fresh parsley or chives, finely chopped, for garnish (optional)

Equipment (9)

2 large rimmed baking sheets (18×13-inch / 46×33 cm)
Parchment paper
Large pot (6-quart / 5.7 L)
Potato ricer or food mill (a hand masher works, but the texture will be less smooth)
16-inch (40 cm) piping bag with large open star tip (Ateco 8B or similar, 3/4-inch / 2 cm opening)
Small saucepan
Pastry brush
Colander
Large mixing bowl

Steps

Before you start

Use starchy potatoes such as Russets or Yukon Golds. Waxy potatoes turn gluey and won't hold sharp piped ridges.
Bring the egg yolks and cream to room temperature so they blend in smoothly and don't cool the mash too much.
Fit a piping bag with a large open star tip (about 3/4-inch / 2 cm opening) before you start, because the mash pipes best while it is still warm.
Total time is about 1 hour 30 minutes, and the potatoes can be piped up to a day ahead (see make-ahead).

1
Prep oven and pansOven 425°F / 220°C
- Position racks in the upper and lower thirds of the oven and heat to 425°F (220°C).
- Line two baking sheets with parchment paper and brush the parchment lightly with the 1 tbsp melted butter.
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Ready when: Parchment is flat and lightly glossy with butter.
2
Boil the potatoes
- Put the potato chunks in a large pot, cover with cold water by 1 inch (2.5 cm), and stir in the 1 tbsp kosher salt.
- Bring to a boil over high heat, then reduce to medium so the water simmers steadily.
- Cook 15 to 20 minutes.
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Ready when: A paring knife slides into the center of a chunk with no resistance, and the edges begin to crumble.
Tip: Start in cold water so the potatoes cook evenly through instead of going mushy outside and hard inside.
3
Warm butter and cream
- While the potatoes cook, combine the 4 tbsp butter pieces and 1/4 cup (60 ml) cream in a small saucepan.
- Heat over low heat, stirring occasionally, just until the butter melts and the cream is warm to the touch.
- Remove from the heat.
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Ready when: Butter is fully melted and the mixture is warm, with no bubbling.
Tip: Don't let it boil, which can make the cream separate.
4
Drain and dry
- Drain the potatoes well in a colander.
- Return them to the empty hot pot and set it over low heat for 1 to 2 minutes, shaking the pot gently.
- Alternatively, let them sit in the colander for 3 minutes so the steam escapes.
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Ready when: A thin, floury film forms on the bottom of the pot and the potatoes no longer look wet.
Tip: Wet potatoes make a loose mash that slumps instead of holding piped ridges.
5
Rice the potatoes
- Press the hot potatoes through a ricer or food mill into a large bowl, working in batches.
- If using a masher, mash until completely free of lumps.
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Ready when: The potatoes look like fine, fluffy grains with no lumps.
Tip: Never use a blender or food processor, which turns the potatoes gluey.
6
Mix the potato base
- Pour the warm butter and cream over the riced potatoes.
- Add the 3 beaten egg yolks, the nutmeg, 1 tsp fine salt and the pepper.
- Stir with a wide spatula just until smooth and combined.
- Taste and add more salt if needed.
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Ready when: The mash is smooth, thick and holds a soft peak when you lift the spatula. It should be stiff, not runny.
Tip: Stir gently and briefly. Overworking the mash makes it gummy. If it seems loose, don't add more liquid.
7
Pipe the rosettes
- While the mash is still warm, scoop it into the piping bag fitted with the large star tip, filling no more than two-thirds full.
- Pipe 3-inch (7.5 cm) wide swirls, about 2 inches (5 cm) tall, onto the prepared sheets, spacing them 1½ inches (4 cm) apart.
- Make about 16 rosettes total.
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Ready when: Rosettes have sharp, defined ridges and stand upright.
Tip: Pipe in two batches of bag-filling if needed. Cold mash is harder to pipe.
8
Brush with egg wash
- Whisk the extra egg yolk with 1 tbsp cream or milk.
- Gently brush it over the rosettes, covering the ridges and tops but not letting it pool on the parchment.
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Ready when: The rosettes have a light, even sheen.
Tip: Use a light touch so you don't flatten the ridges.
9
Bake until goldenOven 425°F / 220°C
- Bake both sheets at 425°F (220°C) for 22 to 27 minutes.
- Switch the sheets between racks and rotate them front to back halfway through.
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Ready when: The ridges and tips are deep golden brown and crisp, and the centers are hot throughout.
Tip: If the tips brown too quickly, move the sheet to the lower rack for the last few minutes.
10
Rest and serve
- Let the rosettes rest on the pans for 5 minutes so they firm up.
- Sprinkle with the chopped parsley or chives, if using, and lift them off with a thin spatula.
- Serve warm.
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Ready when: The rosettes hold their shape when nudged with a spatula.

Good to know

Tips

Dry potatoes are the secret: steam off the moisture before ricing, or the mash will be too soft to pipe.
Use a large open star tip. Closed star tips make fine ridges that brown unevenly and clog with potato.
If the mash is too stiff to pipe, beat in 1 tbsp warm cream at a time. If it is too soft, spoon it into mounds instead and fork the tops for crispy peaks.
Use a ricer or food mill for the smoothest texture and the sharpest piped ridges.

Make ahead

Pipe the rosettes onto parchment-lined sheets (without the egg wash), cover loosely with plastic wrap and refrigerate up to 24 hours. Brush with egg wash just before baking and add 3 to 5 minutes to the bake time. To freeze, set the piped sheets in the freezer until solid (about 2 hours), transfer to a freezer bag, and bake from frozen at 425°F (220°C) for 30 to 35 minutes.

Storage & reheating

Room temperature: up to 2 hours. Refrigerator: store baked rosettes in an airtight container up to 3 days. Freezer: baked rosettes keep up to 2 months. Reheat on a parchment-lined baking sheet at 375°F (190°C) for 10 to 15 minutes (20 minutes from frozen) until hot and crisp at the edges.

Substitutions

heavy cream → whole milk. Slightly less rich, but works well. Keep the amount the same.
unsalted butter → ghee or plant-based butter. Use the same weight. Ghee gives a nuttier flavor.
fresh parsley or chives → grated Parmesan (2 tbsp). Sprinkle over the egg wash before baking for a savory crust.
nutmeg → pinch of ground white pepper and a little more salt. Nutmeg is traditional, so omit only if you must. The flavor will be more plain.