Name: French Onion Green Bean Casserole
Prep time: 45 min
Cook time: 45 min
Total time: 90 min
Ingredients: 2 tablespoons butter; 2 large yellow onions, thinly sliced lengthwise; salt and ground black pepper to taste; 1 tablespoon sherry vinegar; 2 tablespoons butter; 2.5 tablespoons all-purpose flour; 2.5 cups milk; 1 pinch ground nutmeg; 1 pinch cayenne pepper to taste; 0.25 teaspoon ground thyme; 2 tablespoons melted butter; 0.66666668653488 cup panko bread crumbs; 2 pounds fresh green beans, trimmed; 4 ounces shredded Gruyere cheese, divided; 0.33333334326744 cup grated Parmesan cheese

French Onion Green Bean Casserole

4.5

(189)

143 Reviews

15 Photos

The iconic green bean casserole is reworked with the flavors of French onion soup -- caramelized onions and Gruyere cheese.

By Chef John

Updated on November 23, 2022

Prep Time:

45 mins

Cook Time:

45 mins

Total Time:

1 hrs 30 mins

Servings:

Yield:

10 servings

Jump to Nutrition Facts

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 ½ tablespoons all-purpose flour
2 ½ cups milk
1 pinch ground nutmeg
1 pinch cayenne pepper to taste
¼ teaspoon ground thyme

For the topping:

2 tablespoons melted butter
⅔ cup panko bread crumbs
2 pounds fresh green beans, trimmed
4 ounces shredded Gruyere cheese, divided
⅓ cup grated Parmesan cheese

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.

KathyBarbieri

Nutrition Facts (per serving)

217	Calories
13g	Fat
19g	Carbs
9g	Protein

Nutrition Facts
Servings Per Recipe 10
Calories 217
% Daily Value *
Total Fat 13g	17%
Saturated Fat 8g	40%
Cholesterol 38mg	13%
Sodium 195mg	8%
Total Carbohydrate 19g	7%
Dietary Fiber 4g	13%
Total Sugars 6g
Protein 9g
Vitamin C 17mg	86%
Calcium 259mg	20%
Iron 1mg	7%
Potassium 344mg	7%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.