French Onion Green Bean Casserole

4.5

(184)

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Prep Time: 45 minutes

Cook Time: 45 minutes

Total: 1 hours, 30 minutes

Servings: 10

Cost: $3.60 /serving

French Onion Green Bean Casserole

Ingredients

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Instructions

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Step 1

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

Step 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.

Step 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.

Step 4

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

Step 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.

Step 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.

Step 7

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

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