Mashed Sweet Potatoes with Caramelized Onions

Cutting the potatoes into small cubes before boiling prevents them from becoming waterlogged and results in a fluffier mashed potato side dish.

Mashed Sweet Potatoes with Caramelized Onions Enlarge Image
9 users rated this recipe an average rating of 3.5
8 servings
30 mins
30 mins
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Mashed Sweet Potatoes with Caramelized Onions

cup unsalted butter or butter
pounds yellow onions, peeled, halved, and thinly sliced (7 cups)
teaspoon salt
teaspoon freshly ground black pepper
pounds sweet potatoes or white potatoes, peeled and cut into 1/2-inch cubes (about 10 cups)
cup milk
cup dairy sour cream
Salt and ground black pepper


  1. To caramelize the onions, in a large skillet heat 1/4 cup of the butter. Add the onions and cook, stirring frequently, about 30 minutes or until golden brown. Season with the 1/2 teaspoon salt and pepper. Remove from the heat; set aside.
  2. Meanwhile, cook the potatoes in a large pot, covered, in lightly salted boiling water for 12 minutes or until tender; drain.
  3. Add the remaining 1/4 cup butter to the hot pot and let melt. Add the potatoes to the pot and mash with a potato masher until smooth. Stir in the milk, sour cream, and salt and pepper to taste. Stir in caramelized onions, reserving a few onions for garnish. Cook and stir over low heat until heated through. Transfer to a serving dish. Top with reserved onions. Makes 8 to 10 servings.

From the Test Kitchen

Prepare potatoes through step 3 stirring in the caramelized onions, but do not heat through. Transfer to a 2-1/2- to 3-quart casserole. Cover and chill in the refrigerator up to 24 hours or until ready to serve. Before serving, bake potato-onion mixture in a 325 degree F oven for 55 to 60 minutes or until heated through.

Nutrition Facts

(Mashed Sweet Potatoes with Caramelized Onions)
    Per serving:
  • 299 kcal cal.,
  • 14 g fat
  • (9 g sat. fat,
  • 1 g polyunsaturated fat,
  • 4 g monounsatured fat),
  • 37 mg chol.,
  • 182 mg sodium,
  • 40 g carb.,
  • 6 g fiber,
  • 12 g sugar,
  • 4 g pro.
  • Percent Daily Values are based on a 2,000 calorie diet
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