Caramelized Onion and Horseradish Mashed Potatoes

These are pretty much to-die-for mashed potatoes with a little bit of kick to them:  Caramelized Onion and Horseradish Mashed Potatoes.  I must admit… I was afraid these would be too spicy for my family to eat.  Not to worry– the spicy stuff adds just enough flavor to make them awesome!  Perhaps add a little bit of the horseradish mixture at a time to make sure they are just right for you!

Caramelized Onion and Horseradish Mashed Potatoes

Yield: 10 Servings (3/4 cup per serving)

Prep Time: 20 minutes

Cook Time: 30 minutes

Caramelized Onion and Horseradish Mashed Potatoes


  • 1/4 cup (1/2 stick) butter, divided
  • 4 cups chopped onion
  • 2 teaspoons brown sugar
  • 1 tablespoon white balsamic vinegar (optional)
  • 2 1/2 pounds cubed peeled baking potato
  • 1/2 cup whole milk
  • 1/4 cup Dijon mustard
  • 1 tablespoon fresh lemon juice
  • 2 tablespoons prepared horseradish
  • 1 tablespoon light mayonnaise
  • 1/2 teaspoon salt


  1. Melt 1 tablespoon butter in a medium nonstick skillet over medium-high heat. Add onion and sugar; saute 10 minutes or until caramelized. Remove from heat; stir in vinegar, if desired.
  2. Place potato in a saucepan, and cover with water. Bring to a boil. Reduce heat; simmer 15 minutes or until tender.
  3. Drain and return potato to pan. Add 3 tablespoons butter and milk; mash to desired consistency. Cook 2 minutes or until thoroughly heated, stirring constantly.
  4. Combine Dijon mustard and remaining ingredients in a small bowl, stirring with a whisk until blended. Add Dijon mustard mixture and caramelized onion mixture, stirring to combine.


  • If preparing this as a GLUTEN FREE recipe, just make sure that you are using a brand of mayonnaise that is designated as GF.
  • Nutritional Information Per Serving of 3/4 cup : Calories 177, Calories from Fat 52, Total Fat 6g, Sat Fat 3.3g, Cholesterol 14mg, Sodium 221g, Potassium 624mg, Carbohydrates 29g, Dietary Fiber 3.75g, Sugar 5g, Net Carbs 25.25g, Protein 3.5g
  • Weight Watchers POINTS: SmartPoints: 6, PointsPlus: 5, Old Points Program: 5
SOURCE: (via Cooking Light)

More mashed potato recipes you might enjoy: