Ruth’s Chris–Style Caramelized Onion Mashed Potatoes with Gruyère

These caramelized onion mashed potatoes are inspired by classic steakhouse sides—luxurious, deeply flavorful, and unapologetically rich. Creamy Yukon Gold potatoes are the perfect base, offering a naturally buttery texture that blends beautifully with warm cream and milk. This is the kind of side dish that quietly steals the show.

Slow-cooked caramelized onions bring a gentle sweetness and savory depth that transforms simple mashed potatoes into something truly special. Taking the time to let the onions turn golden and jammy is what gives this dish its signature steakhouse character.

Gruyère cheese adds a nutty, slightly salty richness that melts seamlessly into the potatoes. It’s subtle but unmistakable, elevating the dish without overpowering it. Every bite is smooth, comforting, and layered with flavor.

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These mashed potatoes are perfect alongside steak, roasted chicken, or holiday meals, but they’re indulgent enough to be the centerpiece of the plate. Simple ingredients, treated with care, make this a memorable dish you’ll come back to again and again.

Servings and timing:
Yield: 4–6 servings
Prep time: 15 minutes
Cook time: 35 minutes
Total time: 50 minutes

Ingredients

  • 2½ lbs Yukon Gold potatoes, peeled and cut into chunks
  • 3 tablespoons unsalted butter (plus more for finishing)
  • 1 tablespoon olive oil
  • 2 large sweet onions, thinly sliced
  • ¾ cup heavy cream, warmed
  • ½ cup whole milk, warmed
  • 1½ cups Gruyère cheese, freshly grated
  • 2 cloves garlic, minced
  • Salt and black pepper, to taste
  • Fresh chives or parsley, finely chopped, for garnish

Instructions:

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