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How to Make French Onion Green Bean Casserole - A Step-by-Step Guide

French Onion Green Bean Casserole is a delicious twist on a classic casserole dish. This recipe combines tender green beans with a savory and creamy sauce, then tops it with a crunchy and flavorful French onion topping. It's a perfect side dish for any holiday or gathering, as well as a great way to add some vegetables to your meal.

The combination of the crispy onions and the creamy green bean mixture creates a perfect contrast in texture and flavor. This casserole is comforting and ...

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

Information

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

  • 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

    217 cal.

    • Total Fat: 13g
    • Saturated Fat: 8g
    • Cholesterol: 38mg
    • Sodium: 195mg
    • Total Carbohydrate: 19g
    • Dietary Fiber: 4g
    • Total Sugars: 6g
    • Protein: 9g
    • Vitamin C: 17mg
    • Calcium: 259mg
    • Iron: 1mg
    • Potassium: 344mg

    Categories

    French recipes
    Onion recipes
    Green bean recipes
    Casserole recipes