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Export 7 ingredients for grocery delivery
Step 1
Preheat oven to 350°F. Squeeze green beans lightly in hands to remove water.
Step 2
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.
Step 3
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, mushroom mixture, and water chestnuts; spoon into a lightly greased 13- x 9-inch (3-quart) baking dish.
Step 4
Bake in preheated oven until bubbly around edges, 15 minutes. Remove from oven; top with fried onions or shallots. Return to oven; bake until topping is golden brown, 15 minutes.