Mashed Potato Gratin with Garlic and Onions
Indulge in the creamy decadence of Mashed Potato Gratin with Garlic and Onions, a comforting side dish that elevates classic mashed potatoes to gourmet heights. Velvety mashed russet potatoes are infused with a garlic cream sauce and layered with sweet caramelized onions, while a golden, cheesy breadcrumb topping made with Gruyère and Parmesan adds irresistible texture and flavor. Perfectly seasoned and oven-baked until bubbling and crisp, this gratin is the ultimate crowd-pleaser for holidays or casual dinners alike. Quick to prepare and bursting with rich, savory notes, it’s a luxurious twist on a beloved comfort food that’s guaranteed to impress.
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Recipe Information
Ingredients
- 4 large Russet potatoes
- 6 tablespoons Unsalted butter
- 1.5 cups Heavy cream
- 4 cloves Garlic
- 1 large Yellow onion
- 1 tablespoon Olive oil
- 1 cup Gruyère cheese
- 0.5 cup Parmesan cheese
- 1.5 teaspoons Salt
- 0.5 teaspoons Black pepper
- 0.5 cup Breadcrumbs
- 2 tablespoons Fresh parsley
Instructions
Preheat your oven to 375°F (190°C). Grease a medium-sized baking dish with butter or non-stick spray.
Peel the potatoes and cut them into 2-inch chunks. Place them in a large pot of salted water and bring to a boil. Cook for 15-20 minutes or until the potatoes are fork-tender. Drain and set aside.
While the potatoes cook, thinly slice the onion. Heat 1 tablespoon of olive oil in a skillet over medium heat. Add the sliced onion and cook, stirring often, for 10-12 minutes until caramelized. Set aside.
Finely mince the garlic or press it using a garlic press. Heat 2 tablespoons of butter in a small saucepan over low heat. Add the garlic and sauté for 1-2 minutes until fragrant. Stir in the heavy cream and warm the mixture gently. Remove from heat.
Mash the cooked potatoes using a potato masher or a ricer. Stir in the garlic cream mixture, remaining butter, 1 teaspoon of salt, and 1/2 teaspoon of black pepper. Mix until smooth and creamy.
Spread half of the mashed potatoes into the prepared baking dish. Layer the caramelized onions over the mashed potatoes, then top with the remaining mashed potatoes.
In a small bowl, combine the Gruyère cheese, Parmesan cheese, and breadcrumbs. Sprinkle this mixture evenly over the top of the potatoes.
Bake in the preheated oven for 25-30 minutes, or until the top is golden and crisp.
Remove from the oven and let rest for 5 minutes. Sprinkle with chopped parsley before serving.
Nutrition Facts
Calories |
3523 | ||
|---|---|---|---|
% Daily Value* |
|||
| Total Fat | 194.1 g | 249% | |
| Saturated Fat | 108.7 g | 544% | |
| Polyunsaturated Fat | 3.6 g | ||
| Cholesterol | 550 mg | 183% | |
| Sodium | 5948 mg | 259% | |
| Total Carbohydrate | 326.0 g | 119% | |
| Dietary Fiber | 26.1 g | 93% | |
| Total Sugars | 24.7 g | ||
| Protein | 100.4 g | 201% | |
| Vitamin D | 0.8 mcg | 4% | |
| Calcium | 2055 mg | 158% | |
| Iron | 17.8 mg | 99% | |
| Potassium | 7174 mg | 153% | |
*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
