Portobello mushrooms, also known as portobella mushrooms and crimini mushrooms, or by their scientific name, Agaricus bisporus, are one of the most widely distributed mushrooms, found in every continent and almost every climate. Portobello mushrooms are easy to identify because of their large size, which is at least four inches in diameter, and their characteristic brownish color. Portobello mushrooms also have a deep musty smell that makes it seem like they were just picked up from the forest.

Portobello mushrooms are white and rounded when young. As they mature, the cap of the mushroom becomes flat and acquires their distinguishing dark color. Young Portobello mushrooms are known by the name Crimini or baby Bella.

Portobello mushrooms are rich in potassium, essential amino acids, and vitamin B. They are low in calories and fat-free, but a great source of protein, which makes them a great choice for people watching their cholesterol intake or their waistline.