Caramelized Onion Mashed Potatoes

Caramelized Onion Mashed Potatoes bring together two comfort-food classics into one rich and incredibly flavorful side dish. These creamy, smooth potatoes get their depth from slow-cooked onions, and together they create a warm, cozy flavor that works beautifully with everyday meals and holiday dinners. Because the recipe comes together with simple ingredients, it delivers an impressive taste without adding extra work. Moreover, the buttery texture keeps every bite soft and satisfying.

For generations, cooks have used caramelized onions to elevate simple dishes. When onions cook slowly, their natural sugars develop, creating a sweet and savory richness that enhances everything from stews to roasts. Here, that same technique transforms classic mashed potatoes into something far more memorable.

Although this recipe feels indulgent, it remains wonderfully approachable. The steps are easy, and warming the dairy ensures the potatoes turn out perfectly smooth. As a result, these Caramelized Onion Mashed Potatoes make an excellent addition to any dinner table, offering comfort, depth, and irresistible homemade flavor.

Recipe Yield: 6 servings

INGREDIENTS

2 lb Yukon Gold potatoes, peeled and cut into chunks
2 large yellow onions, thinly sliced
½ cup heavy cream, warmed
¼ cup whole milk, warmed
2 tbsp cream cheese
4 tbsp unsalted butter
1 tbsp olive oil
1 tsp sugar
1 ½ tsp salt, divided
½ tsp black pepper
1 tbsp finely chopped chives (optional)

INSTRUCTIONS

1. Caramelize the onions:
In a large skillet, warm butter and olive oil over medium heat. Add onions, ½ tsp salt, and sugar. Cook slowly for 25–30 minutes, stirring occasionally, until the onions turn deep golden and jammy. Optional quicker method: Sauté the onions in butter and olive oil over medium-high heat for 8–10 minutes until golden and lightly crisp.

2. Cook the potatoes:
Meanwhile, add potatoes to a pot, cover with cold water, and add 1 tsp salt. Bring to a boil, then simmer for 12–15 minutes until fork-tender.

3. Mash until smooth:
Drain well. Mash potatoes until smooth, then gradually mix in the warm heavy cream, warm milk, and cream cheese until silky.

4. Add the onions:
Fold in the caramelized onions, reserving 2 tablespoons for garnish. Adjust seasoning with salt and pepper.

5. Finish and serve:
Transfer to a serving dish and top with the remaining onions and chives. Serve warm.

Helpful Tips to Perfect This Recipe

• Caramelize low and slow: Cooking onions gently over medium heat allows natural sugars to develop, which creates a deep, sweet flavor that elevates the mashed potatoes. Stir occasionally to avoid burning and ensure even browning.
• Warm your dairy: Warm heavy cream and milk blend smoothly into potatoes, preventing gumminess and helping the mashed potatoes stay luxuriously fluffy and creamy.
• Choose Yukon Golds: These naturally buttery potatoes whip incredibly well and hold a silky texture, which pairs perfectly with caramelized onions for a restaurant-quality finish.