French Onion Green Bean Casserole

4.5
(189)

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

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Prep Time:
45 mins
Cook Time:
45 mins
Total Time:
1 hrs 30 mins
Servings:
10
Yield:
10 servings

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

  • cup panko bread crumbs

  • 2 pounds fresh green beans, trimmed

  • 4 ounces shredded Gruyere cheese, divided

  • cup grated Parmesan cheese

Directions

  1. Preheat oven to 375 degrees F (190 degrees C). Grease a 9x13 inch casserole dish.

  2. 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.

  3. 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.

  4. Melt remaining 2 tablespoons butter in clean skillet; stir in panko until all crumbs are coated; reserve.

  5. 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.

  6. 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.

  7. Bake in the preheated oven until hot throughout and lightly browned, about 30 minutes. Let sit 10 minutes before serving.

    green bean casserole in a glass dish and on a white plate
    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.

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