Description
This French Onion Green Bean Casserole is a delicious twist on a classic side dish. Caramelized onions, creamy white sauce, and a crispy topping make this recipe a crowd-pleaser.
Ingredients
For the onions:
– 2 tablespoons butter
– 2 large yellow onions, thinly sliced lengthwise
– Salt and ground black pepper to taste
– 1 tablespoon sherry vinegar
For the white sauce:
– 2 tablespoons butter
– 2 1/2 tablespoons all-purpose flour
– 2 1/2 cups milk
– 1 pinch ground nutmeg
– 1 pinch cayenne pepper to taste
– 1/4 teaspoon ground thyme
For the topping:
– 2 tablespoons melted butter
– 2/3 cup panko bread crumbs
– 2 pounds fresh green beans, trimmed
– 4 ounces shredded Gruyere cheese, divided
– 1/3 cup grated Parmesan cheese
Instructions
1. Preheat the oven to 375°F (190°C).
2. In a large skillet, melt 2 tablespoons of butter over medium heat. Add the sliced onions, season with salt and pepper, and cook until caramelized.
3. Stir in the sherry vinegar and cook for another minute. Remove from heat and set aside.
4. In a saucepan, melt 2 tablespoons of butter. Stir in the flour and cook for 1-2 minutes. Gradually whisk in the milk until smooth.
5. Add nutmeg, cayenne, and thyme to the sauce. Cook until thickened, then remove from heat.
6. In a separate bowl, combine melted butter and panko bread crumbs for the topping.
7. In a large pot of boiling water, blanch the green beans for 2-3 minutes. Drain and plunge into ice water to stop cooking.
8. In a baking dish, layer green beans, caramelized onions, white sauce, Gruyere cheese, and Parmesan cheese. Top with the panko mixture.
9. Bake for 25-30 minutes until bubbly and golden brown.
Notes
– For a lighter version, use low-fat milk and cheese.
– Add crispy bacon or fried shallots for extra flavor.
Nutrition
- Serving Size: 1 serving
- Calories: 320
- Sugar: 7g
- Sodium: 410mg
- Fat: 18g
- Saturated Fat: 11g
- Unsaturated Fat: 6g
- Trans Fat: 0g
- Carbohydrates: 30g
- Fiber: 5g
- Protein: 13g
- Cholesterol: 50mg