Go Back
–+ servings
Baked French Onion Mashed Potatoes

Baked French Onion Mashed Potatoes for Ultimate Comfort

Baked French Onion Mashed Potatoes combine creamy Yukon Gold potatoes with caramelized onions and Gruyère cheese for a comforting side dish.
Print Recipe Pin Recipe
Prep Time 20 minutes
Cook Time 1 hour
Resting Time 5 minutes
Total Time 1 hour 25 minutes
Servings: 6 servings
Course: Baking
Cuisine: French
Calories: 350
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Potatoes
  • 3 lbs Yukon Gold potatoes Provides a naturally buttery flavor and creamy texture; Russets can substitute.
  • 4 tablespoons butter Contributes to the overall creaminess.
  • 1/2 cup heavy cream (warm) Warming prevents gumminess.
  • 1 teaspoon salt Essential for flavor.
  • 1/2 teaspoon black pepper Adds mild heat.
For the Onions
  • 2 large yellow onions Adds sweetness through caramelization.
  • 2 tablespoons olive oil Used for sautéing.
  • 1-2 cloves garlic (minced, optional) Enhances the flavor when added during caramelization.
For the Topping
  • 1 cup shredded Gruyère cheese (divided) Offers a creamy melt.
  • Fresh thyme or parsley (chopped, optional garnish) Adds freshness for presentation.

Equipment

  • large skillet
  • Pot
  • Baking Dish

Method
 

Preparation Steps
  1. Caramelize Onions: Slice the onions and sauté in olive oil over medium-low heat for 30-40 minutes until golden brown. Add garlic in the last 5 minutes if desired.
  2. Prepare Potatoes: Peel and cut the Yukon Gold potatoes into chunks, boil in salted water for 15-20 minutes until fork-tender. Drain and return to pot.
  3. Mash Potatoes: Add butter, warm cream, salt, and pepper to the potatoes and mash until smooth. Adjust seasoning as needed.
  4. Combine Ingredients: Preheat oven to 375°F. Fold in half of the Gruyère and two-thirds of the caramelized onions into the potatoes.
  5. Bake: Transfer to a greased baking dish, top with remaining onions and Gruyère. Bake for 20-25 minutes until golden and bubbly.
  6. Serve: Let rest for 5 minutes, garnish with thyme or parsley, and serve warm.

Nutrition

Serving: 1cupCalories: 350kcalCarbohydrates: 40gProtein: 9gFat: 18gSaturated Fat: 10gPolyunsaturated Fat: 1gMonounsaturated Fat: 7gCholesterol: 50mgSodium: 500mgPotassium: 800mgFiber: 4gSugar: 2gVitamin A: 500IUVitamin C: 20mgCalcium: 200mgIron: 2mg

Notes

Optional: Drizzle with truffle oil for an extra gourmet touch.

Tried this recipe?

Let us know how it was!