Slice and dice the chicken breast. Cook in pan on stove until meat is fully cooked. Add a pinch of garlic powder and black pepper while cooking.
Slice up the green onion and put in separate pan with sliced mushrooms and sliced carrot (if used) and set heat at medium and fry them while dousing some teriyaki sauce over them. Get them nice and hot.
Steam the rice in either a pot or rice cooker.
Put cooked rice at bottom of a bowl. Add veggies and chicken to the top of the rice and douse as much teriyaki sauce as desired. Enjoy!