Wild Mushroom Green Bean Casserole

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4 tablespoons unsalted butter

1 large white onion, diced

4 garlic cloves, minced

2 pounds green beans, trimmed and halved

1 pound assorted wild mushrooms, such as chanterelle, oyster or trumpet, torn by hand

1/4 cup bourbon

2 tablespoons all-purpose flour

2 cups heavy cream

2 tablespoons fresh thyme, minced

Kosher salt and freshly ground black pepper

1/2 cup panko

2 tablespoons truffle oil

1 fresh black truffle

4 ounces chopped fresh parsley