Ingredients:
- for the onions
- salt and ground black pepper to taste
- for the white sauce
- cayenne pepper to taste (optional)
- for the topping
Directions:
- Preheat oven to 375 degrees F (190 degrees C). Grease a 9x13 inch casserole dish.
- Heat 2 tablespoons of butter in a large skillet over medium heat. Stir the onions into the pan; cook and stir until very soft and golden brown, about 15 minutes. Stir in sherry vinegar. Transfer to a small bowl, and reserve.
- In the same skillet, melt 2 more tablespoons butter. Whisk in 2 tablespoons flour. Stirring constantly, cook over medium heat until the flour smells like baked pie crust, about 3 minutes. Slowly whisk in milk, about 1/2 cup at a time, then whisk in nutmeg, cayenne pepper, and thyme. Bring to simmer, and cook until thickened, whisking constantly, 3 more minutes. Transfer to a bowl and reserve.
- Melt remaining 2 tablespoons butter in clean skillet; stir in panko until all crumbs are coated; reserve.
- Bring a large saucepan of salted water to a boil over medium heat, and boil beans until bright green and crisp but not raw tasting, 3 to 4 minutes. Drain very well.
- Spoon half of the caramelized onions into the prepared casserole dish; top with green beans. Season with salt and black pepper. Spread reserved white sauce over the green beans; sprinkle with half of the Gruyere cheese. Top with the rest of the onions, and use the back of a spoon to push onions down into sauce and cheese. Top with the buttered panko crumbs, the remaining Gruyere, and Parmesan cheese.
- Bake in the preheated oven until hot throughout and lightly browned, about 30 minutes. Let sit 10 minutes before serving.
Nutrition Facts
| Amount Per 1 Serving | |||
| Calories | 220.14 Kcal (922 kJ) | ||
| Calories from fat | 126.63 Kcal | ||
| % Daily Value* | |||
| Total Fat | 14.07g | 22% | |
|---|---|---|---|
| Cholesterol | 34.92mg | 12% | |
| Sodium | 133.4mg | 6% | |
| Potassium | 333.84mg | 7% | |
| Total Carbs | 15.49g | 5% | |
| Sugars | 5.96g | 24% | |
| Dietary Fiber | 3.36g | 13% | |
| Protein | 9.21g | 18% | |
| Vitamin C | 11.4mg | 19% | |
| Vitamin A | 0.1mg | 3% | |
| Iron | 1mg | 5% | |
| Calcium | 279.8mg | 28% | |
| Amount Per 100 g | |||
| Calories | 107.73 Kcal (451 kJ) | ||
| Calories from fat | 61.97 Kcal | ||
| % Daily Value* | |||
| Total Fat | 6.89g | 22% | |
|---|---|---|---|
| Cholesterol | 17.09mg | 12% | |
| Sodium | 65.28mg | 6% | |
| Potassium | 163.37mg | 7% | |
| Total Carbs | 7.58g | 5% | |
| Sugars | 2.92g | 24% | |
| Dietary Fiber | 1.65g | 13% | |
| Protein | 4.51g | 18% | |
| Vitamin C | 5.6mg | 19% | |
| Iron | 0.5mg | 5% | |
| Calcium | 136.9mg | 28% | |
* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.
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