French Onion Green Bean Casserole

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Description

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

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

Instructions

  1. Preheat oven to 375 degrees F (190 degrees C). Grease a 9×13 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
  3. about 15 minutes. Stir in sherry vinegar. Transfer to a small bowl
  4. and reserve.
  5. In the same skillet
  6. melt 2 more tablespoons butter. Whisk in 2 tablespoons flour. Stirring constantly
  7. cook over medium heat until the flour smells like baked pie crust
  8. about 3 minutes. Slowly whisk in milk
  9. about 1/2 cup at a time
  10. then whisk in nutmeg
  11. cayenne pepper
  12. and thyme. Bring to simmer
  13. and cook until thickened
  14. whisking constantly
  15. 3 more minutes. Transfer to a bowl and reserve.
  16. Melt remaining 2 tablespoons butter in clean skillet; stir in panko until all crumbs are coated; reserve.
  17. Bring a large saucepan of salted water to a boil over medium heat
  18. and boil beans until bright green and crisp but not raw tasting
  19. 3 to 4 minutes. Drain very well.
  20. 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
  21. and use the back of a spoon to push onions down into sauce and cheese. Top with the buttered panko crumbs
  22. the remaining Gruyere
  23. and Parmesan cheese.
  24. Bake in the preheated oven until hot throughout and lightly browned
  25. about 30 minutes. Let sit 10 minutes before serving.

Prep Time: 45 mins

Cook Time: 45 mins

Total Time: 1 hr 30 mins

Servings: 10

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