Portabella mushrooms, also known as cremini or brown mushrooms, are a type of edible mushroom with a rich, earthy flavor. They have a dark brown or tan cap with a smooth, slightly curved surface and a firm, meaty texture. Portabellas have a mild, nutty taste, making them a versatile ingredient in many different dishes. They are often used in soups, sauces, stews, and stir-fries, as well as on their own as a side dish or main course. They are also a good source of vitamins and minerals, including potassium, niacin, and phosphorus.