Onion Parmesan Gratin
Indulge in the creamy, savory perfection of Onion Parmesan Gratin, a comforting dish that transforms humble yellow onions into a show-stopping side or standout vegetarian entrée. This recipe features tender onion rings baked in a luscious Parmesan-infused cream sauce, topped with a golden, crunchy panko breadcrumb crust for an irresistible blend of textures. Enhanced with hints of nutmeg and finished with a sprinkle of fresh parsley, this gratin is rich in flavor yet delightfully balanced. With just 15 minutes of prep time and simple pantry staples like butter, milk, and Parmesan, this dish is both elegant and easy to make. Ideal for holiday dinners or weeknight indulgence, it serves up warmth and decadence in every bite!
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Recipe Information
Ingredients
- 3 pieces Large yellow onions
- 2 tablespoons Unsalted butter
- 2 tablespoons All-purpose flour
- 1.5 cups Milk
- 0.5 cups Heavy cream
- 1 cup Grated Parmesan cheese
- 1 teaspoon Salt
- 0.5 teaspoon Ground black pepper
- 0.25 teaspoon Ground nutmeg
- 0.5 cup Panko breadcrumbs
- 1 tablespoon Olive oil
- 2 tablespoons Fresh parsley (optional, chopped for garnish)
Instructions
Preheat your oven to 375°F (190°C).
Peel the onions and cut them into 1/2-inch thick slices. Separate into individual rings and set aside.
Bring a large pot of water to a boil with a pinch of salt. Add the onion rings to the boiling water and cook for 5 minutes to soften slightly. Drain and set aside to cool.
In a medium saucepan, melt the butter over medium heat. Once melted, whisk in the flour and cook for 1 minute to form a roux.
Slowly whisk in the milk and heavy cream, making sure there are no lumps. Continue stirring until the mixture begins to thicken, about 3-4 minutes.
Remove the saucepan from the heat and stir in 3/4 cup of grated Parmesan cheese, salt, pepper, and nutmeg. Adjust seasoning as needed.
Lightly grease a 9x13-inch baking dish with butter or non-stick spray. Spread the blanched onion rings evenly in the dish.
Pour the Parmesan cream sauce over the onions, ensuring they are well coated.
In a small bowl, mix the breadcrumbs, olive oil, and remaining 1/4 cup of Parmesan cheese until evenly combined.
Sprinkle the breadcrumb mixture evenly over the top of the dish.
Bake in the preheated oven for 25-30 minutes, or until the top is golden brown and bubbling.
Remove from the oven and allow to cool for 5-10 minutes before serving. Garnish with chopped parsley, if desired.
Nutrition Facts
Calories |
1580 | ||
|---|---|---|---|
% Daily Value* |
|||
| Total Fat | 111.7 g | 143% | |
| Saturated Fat | 60.8 g | 304% | |
| Polyunsaturated Fat | 1.6 g | ||
| Cholesterol | 295 mg | 98% | |
| Sodium | 4096 mg | 178% | |
| Total Carbohydrate | 91.9 g | 33% | |
| Dietary Fiber | 9.6 g | 34% | |
| Total Sugars | 40.1 g | ||
| Protein | 54.8 g | 110% | |
| Vitamin D | 4.0 mcg | 20% | |
| Calcium | 1473 mg | 113% | |
| Iron | 2.9 mg | 16% | |
| Potassium | 1318 mg | 28% | |
*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.
