Garlic Parmesan Duchess Potatoes are a classic way to make mashed potatoes feel special. The potatoes are enriched with roasted garlic, Parmesan, and egg yolks, then piped into beautiful swirls and baked.
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This side dish looks impressive but is straightforward to prepare. It takes about an hour and a half from start to finish, with much of that being hands-off time while the garlic and potatoes cook.
Why You'll Love This Recipe
- Roasting the garlic first makes it sweet and mellow, adding deep flavor to the potatoes without any harshness
- Using only egg yolks adds richness and structure to the mash, helping the piped shapes hold up in the oven
- Piping and baking the potatoes creates more surface area, resulting in wonderfully crisp edges and a soft, fluffy center
Essential Ingredients
- Potatoes: Starchy potatoes like Russets or Yukon Golds are best. They become fluffy when cooked and mash up smoothly.
- Parmesan Cheese: Use a block of Parmesan and grate it yourself. Pre-shredded cheese often has anti-caking agents that can affect the texture.
- Egg Yolks: Bring your eggs to room temperature before separating. Room temperature yolks will incorporate more easily into the warm potato mixture.
- Piping Tip: A large open star tip, like a Wilton 1M, creates the classic duchess potato look with defined ridges that get extra crispy.
The full ingredients list, including measurements, is provided in the recipe card directly below.
Let’s Make it together
Roast Garlic and Cook Potatoes: Start by roasting a whole head of garlic in the oven until it’s soft and caramelized. While it roasts, peel, chop, and boil your potatoes in salted water until they are tender.
Create the Potato Base: Drain the potatoes and let them steam dry for a few minutes. Mash them with butter and cream, then stir in the soft roasted garlic, Parmesan cheese, and seasonings. Let this mixture cool slightly.
Pipe and Bake: Once cooled, mix in the egg yolks until the potato base is smooth and glossy. Transfer it to a piping bag and pipe swirls onto a prepared baking sheet. Brush with melted butter and bake until golden brown and crisp.
You Must Know
- For food safety, dishes containing eggs should be cooked to an internal temperature of 160°F (71°C)
- If you don’t have a piping bag, you can spoon mounds of the potato mixture onto the baking sheet and create texture on the surface with the back of a fork
- The potatoes can be piped onto the baking sheet, covered, and refrigerated for up to 24 hours before baking
- Just add a few minutes to the baking time
- Letting the potatoes steam dry after boiling is crucial
- Too much water will make the mixture loose and difficult to pipe
Serving Ideas
These potatoes are a wonderful accompaniment to a roasted chicken, a seared steak, or a holiday main like a baked ham or turkey.
Storing & Reheating
Store leftovers in an airtight container in the refrigerator for up to 3 days. They can also be frozen for up to 2 months. Reheat in a 350°F (175°C) oven for 10-15 minutes, or until heated through and crisp again.
FAQ
Can I make these ahead of time?
Yes. You can prepare and pipe the potatoes onto a baking sheet, then cover and refrigerate for up to 24 hours. Bake them straight from the fridge, adding a few extra minutes to the baking time.
Why didn’t my potatoes hold their shape?
This usually happens if the potato mixture is too wet. Make sure to use starchy potatoes and let them steam dry thoroughly after boiling before you mash them. Also, don’t skip the egg yolks, as they act as a binder.
Can I use a different cheese?
Certainly. Gruyère would add a nutty flavor, or you could use Pecorino Romano for a saltier, sharper taste. Use a hard, aged cheese for the best results.
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📖 Recipe Card
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Garlic Parmesan Duchess Potatoes
- Total Time: 90 minutes
- Yield: 10-12 mounds 1x
Description
Fluffy mashed potatoes with roasted garlic and Parmesan, piped into elegant swirls and baked until golden.
Ingredients
- 3 lbs (1.35 kg) starchy potatoes, like Russet or Yukon Gold
- 1 large head of garlic
- 1 tsp olive oil
- 5 tbsp (70g) unsalted butter, divided
- 2 tbsp (30 ml) heavy cream, room temperature
- 3/4 cup (60g) freshly grated Parmesan cheese, plus more for serving
- 4 large egg yolks, room temperature
- 1/2 tsp salt, plus more for boiling water
- 1/4 tsp black pepper
- 1 tbsp finely chopped fresh parsley, for garnish
Instructions
- Preheat your oven to 400°F (200°C). Slice the top quarter-inch off the head of garlic to expose the cloves. Place it on a small piece of aluminum foil, drizzle with olive oil, and wrap it tightly. Roast for 40-50 minutes, until the cloves are very soft and golden. Let it cool slightly, then squeeze the soft garlic paste out of the skins into a small bowl. Mash with a fork and set aside.
- While the garlic roasts, peel the potatoes and cut them into 1-inch cubes. Place them in a large pot with cold, salted water, ensuring the water covers them by at least an inch. Bring to a boil over high heat, then reduce heat to a simmer and cook for 15-20 minutes, or until fork-tender.
- Drain the potatoes well in a colander. Let them sit for 5 minutes to allow excess steam and moisture to escape, shaking the colander once or twice. This step helps make the potatoes fluffy.
- Return the dry potatoes to the pot or a large bowl. Add 3 tablespoons of room-temperature butter and the heavy cream. Mash until smooth using a potato masher or ricer.
- Stir in the roasted garlic paste, grated Parmesan, 1/2 teaspoon of salt, and pepper. Mix until just combined. Taste and add more salt and pepper if needed. Let the mixture cool for 5-10 minutes so it’s not steaming hot.
- Add the egg yolks one at a time, mixing well after each addition until fully incorporated. The mixture should be thick and glossy.
- Transfer the potato mixture to a large piping bag fitted with a large star tip (like a Wilton 1M). Pipe 2-inch wide swirls onto a large baking sheet lined with parchment paper. You should get 10-12 mounds.
- Melt the remaining 2 tablespoons of butter and gently brush or drizzle it over the tops of the potato mounds.
- Bake for 15-20 minutes, or until the edges are golden brown and crisp. For food safety, the internal temperature should reach at least 160°F (71°C). Garnish with fresh parsley and extra Parmesan before serving.
Notes
- For food safety, dishes containing eggs should be cooked to an internal temperature of 160°F (71°C).
- If you don’t have a piping bag, you can spoon mounds of the potato mixture onto the baking sheet and create texture on the surface with the back of a fork.
- The potatoes can be piped onto the baking sheet, covered, and refrigerated for up to 24 hours before baking. Just add a few minutes to the baking time.
- Letting the potatoes steam dry after boiling is crucial. Too much water will make the mixture loose and difficult to pipe.
- Prep Time: 25 minutes
- Cook Time: 65 minutes
- Category: Side Dish
- Method: Baking
- Cuisine: French-inspired
