Green bean casserole is great, but we just made it better. Our French Onion Green Bean Casserole is cheesy, creamy, and decadent, with a nice balance of Gruyere béchamel sauce, fresh blanched green beans, caramelized onions, and shaved Parmesan. On top there’s a thick layer of Parmesan and panko, which adds crunchiness while stepping away from traditional toasted onions and adds some serious flavor. Using dry sherry and time give the flavor a new twist, more like what you’d find in French Onion Soup, and elevate the feel of this traditional casserole. Be sure to take time with caramelizing the onions. If you turn up the heat too high or try to caramelizing them too quickly, the onions will burn. Feel free to swap out the panko topping for classic bread crumbs or saltine crackers if you’re looking for a more traditional feel.