2 pounds green beans, trimmed and cut into 2-inch pieces

6 tablespoons unsalted butter, divided, plus more for the baking dish

3/4 cup sliced shallots

1 red bell pepper, seeded, finely diced

8 to 10 ounces mixed sliced mushrooms such as shiitake (remove stems) and cremini

Kosher salt to taste

2 tablespoons all-purpose flour

1/4 cup dry sherry

2 cups whole milk or 2 percent milk

1 round (5 ¼ ounces) Boursin cheese (regular or light)

1/4 teaspoon freshly ground black pepper

Grated zest of 1 lemon

2 tablespoons fresh tarragon

3/4 cup panko bread crumbs

3/4 cup grated or shredded Parmesan cheese

3/4 cup sliced almonds

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