Description
This Twice Baked French Onion Mashed Potatoes recipe is the ultimate comfort food upgrade. Creamy mashed russet potatoes are mixed with butter, heavy cream, and nutty Gruyère cheese, then baked under a sweet-savory blanket of caramelized onions. It’s perfect for holidays or cozy family dinners. Whether you’re looking for a comforting side for your roast or just love bold, French-inspired flavors, this easy recipe is the hearty companion you’ve been craving. Packed with flavor, perfect for meal prepping, and ideal as a show-stealing dish, it’s a must-add to your collection of dinner ideas, comfort food recipes, and side dish staples.
Ingredients
6 large russet potatoes
2 large yellow onions
4 tablespoons butter
1 tablespoon olive oil
1 cup heavy cream
1.5 cups shredded Gruyère cheese
1 teaspoon salt
1/2 teaspoon black pepper
1 tablespoon chopped fresh parsley (optional)
Instructions
1. Slice the yellow onions thin and cook them in olive oil and butter over medium-low heat, stirring often, until deeply caramelized (about 30–40 minutes).
2. Peel and chop the russet potatoes into chunks. Boil in salted water until fork-tender (15–20 minutes), then drain well.
3. Mash the hot potatoes with butter, warmed heavy cream, salt, pepper, and Gruyère until creamy and smooth.
4. Preheat oven to 375°F and butter a baking dish. Spread the mashed potatoes evenly into the dish.
5. Top the mashed potatoes with caramelized onions and a sprinkle of extra cheese if desired.
6. Bake uncovered for 25 minutes or until bubbly and golden on top.
7. Garnish with fresh parsley before serving.
Notes
Be patient when caramelizing the onions—low and slow gives you that deep flavor.
Warm the cream before mixing it into the potatoes to avoid cooling them down too quickly.
- Prep Time: 20 minutes
- Cook Time: 60 minutes
- Category: Side Dish
- Method: Baking
- Cuisine: American, French-Inspired
Nutrition
- Serving Size: 1 cup
- Calories: 315
- Sugar: 4g
- Sodium: 310mg
- Fat: 18g
- Saturated Fat: 11g
- Unsaturated Fat: 6g
- Trans Fat: 0g
- Carbohydrates: 32g
- Fiber: 3g
- Protein: 7g
- Cholesterol: 55mg
Keywords: french onion potatoes, holiday sides, mashed potato bake, cheesy potatoes, comfort food