Caramelized Onions Mashed Potatoes recipe

Jazz up the classic side dish by adding fragrant, sweet, caramelized onions to creamy mashed potatoes. The flavor is irresistible! 

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Course Side Dish
Cuisine American
Keyword potatoes
Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes
Servings 6 people
Calories 297 kcal
Author Anna


  • 3 lbs Russet potatoes
  • 2 tablespoons unsalted butter
  • 1/4 cup half and half or sour cream
  • 1 medium white onion 1.5 cups chopped
  • 2 teaspoons minced garlic
  • 2 tablespoons unsalted butter divided
  • 1 tablespoon olive oil
  • 1 teaspoon packed brown sugar
  • 1 teaspoon low-sodium soy sauce
US Customary - Metric


  1. Peel and chop potatoes. Place in a pot, cover with cold water and bring to boil over medium heat. Cook until soft. Drain well, add butter and sour cream (or half and half) and mash. Season with salt and pepper to taste.
  2. In a large skillet, heat up olive oil. Add one tablespoon of butter and let melt. Add minced garlic and chopped onions. Saute, stirring often until fragrant, translucent and some pieces are golden.
  3. Add second tablespoon of butter. Stir in, melting, and cook onions until golden brown and caramelized. Add brown sugar and soy sauce. Stir in. Remove from heat.
  4. Stir in caramelized onions with mashed potatoes. Serve right away or cool completely, cover with saran wrap and store in the fridge for the next day.

Recipe Notes

One cup equals one serving. 

The nutritional value is for mashed potatoes with sour cream. 

To make ahead: cool completely, cover with saran wrap and store in the fridge for the next day. You can reheat this dish in a skillet on the stove or place them in a casserole dish and reheat in the oven. Add milk or sour cream and butter as needed.


Nutrition Facts
Caramelized Onions Mashed Potatoes recipe
Amount Per Serving
Calories 297 Calories from Fat 99
% Daily Value*
Total Fat 11g 17%
Saturated Fat 6g 30%
Cholesterol 25mg 8%
Sodium 48mg 2%
Potassium 986mg 28%
Total Carbohydrates 44g 15%
Dietary Fiber 3g 12%
Sugars 3g
Protein 5g 10%
Vitamin A 5.9%
Vitamin C 17.7%
Calcium 4.6%
Iron 11%
* Percent Daily Values are based on a 2000 calorie diet.