Portobello mushrooms are large, mature versions of cremini mushrooms and are known for their meaty texture and rich flavor. They are typically brown in color and can grow up to six inches in diameter. These mushrooms are often used as a meat substitute in various dishes due to their hearty nature. Rich in nutrients, Portobello mushrooms are low in calories and provide essential vitamins and minerals, including B vitamins, selenium, and potassium. They can be grilled, roasted, or stuffed, making them a versatile ingredient in vegetarian and vegan cooking.