Chop vegetables and set aside. Once portobellos have marinated, heat a large skillet over medium heat and add a bit of sesame oil. Then add only as many portobellos as will fit comfortably in the pan (see photo), and sauté for 2-4 minutes on each side or until golden brown and slightly seared. You may have to do this in two batches depending on the size of your pan.
*Nutrition information is a rough estimate calculated without additional toppings/sides.