Savory French Onion Green Bean Casserole

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An elevated holiday side dish featuring fresh green beans, slow-caramelized onions, and a rich Gruyere cheese sauce topped with crispy panko.

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2 tablespoons unsalted butter

2 large yellow onions, sliced lengthwise

1 tablespoon apple cider vinegar

2.5 tablespoons all-purpose flour

2.5 cups whole milk

1 pinch ground nutmeg

1/4 teaspoon ground thyme

2 pounds fresh green beans, trimmed

4 ounces Gruyere cheese, shredded

1/3 cup Parmesan cheese, grated

2/3 cup panko bread crumbs

2 tablespoons butter, melted

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1. Preheat oven to three hundred seventy five Fahrenheit and grease a 9×13 dish.

2. Caramelize onions in butter until mahogany brown, about 15 minutes, then deglaze with vinegar.

3. In the same skillet, make a roux with butter and flour; whisk in milk, nutmeg, and thyme until thickened.

4. Blanch green beans in boiling salted water for 4 minutes, then drain and dry.

5. Toss panko with melted butter.

6. Layer half the onions, all the green beans, and the white sauce in the dish.

7. Top with Gruyere, remaining onions, buttered panko, and Parmesan.

8. Bake for 30 minutes until bubbly and golden.

9. Rest for 10 minutes before serving.

Dry the blanched beans thoroughly to avoid a watery sauce.

Always grate the Gruyere from a block for better melting.

Caramelize onions low and slow to prevent burning.

Find it online: https://www.flavourrecipe.com/french-onion-green-bean-casserole/