Marinate the chicken breasts in teriyaki sauce for at least 15 minutes.
Heat vegetable oil in a skillet over medium heat.
Remove chicken from marinade and season with salt and pepper.
Cook the chicken in the skillet for 6-7 minutes on each side until fully cooked.
While the chicken cooks, steam the broccoli and carrots until tender.
Remove the chicken from the skillet and let it rest for a few minutes.
Slice the chicken into strips.
In the same skillet, add remaining teriyaki sauce and heat.
Assemble the bowls with cooked rice, sliced chicken, steamed vegetables, and sauce.
Garnish with sesame seeds and green onions before serving.