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–+ servings
A bowl of creamy mashed potatoes topped with caramelized onions and fresh thyme.

Caramelized Onion Mashed Potatoes

Creamy mashed potatoes infused with the sweet, savory flavor of caramelized onions.
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Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Servings: 6 servings
Course: Side Dish
Cuisine: American
Ingredients Equipment Method Notes

Ingredients
  

For the Potatoes
  • 2 lbs Yukon Gold potatoes peeled and quartered
  • 1/2 cup milk warmed
  • 4 tbsp butter unsalted
  • 1 tsp salt or to taste
  • 1/2 tsp black pepper or to taste
For the Caramelized Onions
  • 2 large yellow onions thinly sliced
  • 1 tbsp olive oil
  • 1 tbsp butter unsalted

Equipment

  • Large pot
  • Skillet
  • Potato masher

Method
 

  1. Place the quartered potatoes in a large pot and cover with cold water. Add a pinch of salt. Bring to a boil and cook for 15-20 minutes, or until fork-tender.
  2. While the potatoes are cooking, heat the olive oil and butter in a skillet over medium-low heat. Add the sliced onions and cook slowly, stirring occasionally, for 30-40 minutes, or until deeply caramelized and sweet. Season with salt and pepper.
  3. Drain the cooked potatoes well. Return them to the hot, empty pot. Mash the potatoes with a potato masher until mostly smooth.
  4. Add the warmed milk and 4 tablespoons of butter to the mashed potatoes. Stir until the butter is melted and the potatoes are creamy. Season with salt and pepper to taste.
  5. Gently fold in the caramelized onions. Serve hot.

Notes

For an extra rich flavor, you can add a splash of heavy cream along with the milk. You can also add a pinch of sugar to the onions while caramelizing to help them brown faster.

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