Chestnut mushrooms, also known as brown or cremini mushrooms, are a variety of Agaricus bisporus, closely related to the white button mushroom. They have a firmer texture and a deeper, earthier flavor compared to their white counterparts. Chestnut mushrooms are light to dark brown in color with a smooth, rounded cap and a dense, meaty interior. When cooked, they hold their shape well and develop a rich, savory taste, making them a popular choice for sautés, stews, and roasted dishes. These mushrooms are also a good source of antioxidants, B vitamins, and minerals like selenium and copper.