Ingredients for - French Onion Green Bean Casserole

1. Butter 2 tablespoons
2. Yellow onions, thinly sliced lengthwise 2 large
3. Salt and ground black pepper to taste 2 large
4. Sherry vinegar 1 tablespoon
5. Butter 2 tablespoons
6. All-purpose flour 2 ½ tablespoons
7. Milk 2 ½ cups
8. Ground nutmeg 1 pinch
9. Cayenne pepper to taste 1 pinch
10. Ground thyme ¼ teaspoon
11. Melted butter 2 tablespoons
12. Panko bread crumbs ⅔ cup
13. Fresh green beans, trimmed 2 pounds
14. Shredded Gruyere cheese, divided 4 ounces
15. Grated Parmesan cheese ⅓ cup

How to cook deliciously - French Onion Green Bean Casserole

1 . Stage

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

2 . Stage

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 . Stage

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 . Stage

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

5 . Stage

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 . Stage

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 . Stage

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