French Onion Mashed Potatoes blend the savory depth of caramelized onions and French onion soup with creamy, cheese-laden mashed potatoes for a sophisticated holiday side. The combination of Gruyère, fresh thyme, and deeply browned onions elevates this comfort dish beyond the ordinary.
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In a large pot or Dutch oven over medium heat, melt 2 tbsp of butter. Add the sliced onions, fresh thyme, and a pinch of black pepper.
Cover and cook, stirring occasionally, for about 10-15 minutes until the onions are very soft.
Uncover, add the chicken broth to deglaze the pan, and continue to cook, stirring frequently, until the onions are deeply caramelized and jammy, about 20-25 more minutes. Remove from the pot and set aside.
While the onions cook, place the quartered potatoes in a separate large pot. Cover with cold, salted water and bring to a boil. Cook until the potatoes are fork-tender, about 15-20 minutes.
While the potatoes are boiling, prepare the cheese sauce. In a medium saucepan over medium heat, melt 3 tbsp of butter. Add the minced garlic and sauté for 30-60 seconds until fragrant.
Pour in the heavy cream, then stir in the shredded Gruyère and grated Parmesan cheese. Season with black pepper.
Stir continuously until the cheese is fully melted and the sauce is smooth. Remove from heat.
Drain the cooked potatoes well. Pass them through a potato ricer back into the Dutch oven you used for the onions.
Pour the warm cheese sauce over the riced potatoes.
Gently fold the sauce into the potatoes until just combined. Be careful not to overmix.
Fold in about two-thirds of the caramelized onions and a handful of croutons.
Transfer the mashed potatoes to a serving bowl. Top with the remaining caramelized onions and croutons before serving.
Refrigerate mashed potatoes and caramelized onions separately in airtight containers for up to 3 days; reheat potatoes gently in a pot with a splash of cream, then top with warmed onions and fresh croutons.
Yes. Prepare the caramelized onions up to 2 days ahead and refrigerate. Mash the potatoes with cream and cheese just before serving, then top with the onions and croutons to maintain crispness.
Plan for 30-40 minutes of cooking over medium-low heat, stirring frequently. The onions are ready when deeply golden-brown and very soft, which concentrates their natural sweetness.
Emmental, French Swiss, or aged cheddar work well. Avoid pre-shredded cheese, which contains anti-caking agents that prevent smooth melting.
Yukon Gold is preferred for its buttery flavor and creamy texture, but russets work if you add them to the cooking liquid with extra caution to avoid gluey results from overmixing.
Pierce a quartered potato with a fork; it should break apart easily with no resistance in the center. This typically takes 15-20 minutes depending on size.
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