Asparagus and Mushroom Gratin is a delicious and comforting side dish that combines the earthy flavors of asparagus and mushrooms with a creamy and cheesy sauce. The asparagus is blanched to retain its vibrant green color and then baked with sautéed mushrooms in a rich and creamy sauce. Topped with a crispy breadcrumb and Parmesan cheese crust, this gratin is the perfect accompaniment to any meal.