Victor Protasio
Active Time
20 Mins
Total Time
50 Mins
Serves 10

How to Make It

Step 1

Preheat oven to 350°F. Squeeze green beans lightly in hands to remove water.

Step 2

Cook bacon in a Dutch oven over medium until crisp, 6 to 8 minutes. Drain bacon on paper towels, reserving drippings in Dutch oven. Crumble bacon; set aside.

Step 3

Cook Brussels sprouts and green beans in reserved drippings just until tender and lightly browned, 8 to 10 minutes. Remove vegetables from Dutch oven.

Step 4

Heat 2 tablespoons of the butter in a Dutch oven over medium-high. Add mushrooms and shallot, and cook, stirring often, until mixture is deeply browned and caramelized, 8 to 10 minutes. Transfer mixture to a plate, and without wiping out Dutch oven, add remaining 6 tablespoons butter to Dutch oven. Melt butter over medium-high; whisk in flour, and cook, whisking constantly, 1 minute. Gradually add milk, whisking until smooth. Cook, whisking, until thickened and bubbly, about 4 minutes. Remove from heat, and whisk in Parmesan cheese, kosher salt, and black pepper until melted and smooth. Stir in green beans and Brussels sprouts mixture, mushroom mixture, and water chestnuts; spoon into a lightly greased 13- x 9-inch (3-quart) baking dish.

Step 5

Bake in preheated oven until bubbly around edges, 15 minutes. Remove from oven; top with bacon and fried onions or shallots. Return to oven; bake until topping is golden brown, 15 minutes.

Make it ahead: Prepare recipe through Step 2 up to 3 days in advance; cover and refrigerate. On the day of, add toppings and bake; add 10 minutes to the initial bake time if using a refrigerated casserole.

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