Question: what is the difference between white mushrooms and portobello?
Answer: THEY ARE LITERALLY THE SAME TYPE OF MUSHROOM. They are all Agaricus bisporus, in fact, just different ages: button mushrooms, which are white, are the toddlers; cremini mushrooms, which are brown, are the teenagers; and portobellos, which are brown and much larger versions of their younger selves, are the adults.