Marinate the chicken breasts in teriyaki sauce for at least 15 minutes.
Heat vegetable oil in a pan over medium heat.
Remove chicken from marinade, reserving the marinade for later.
Cook the chicken for 6-7 minutes on each side until golden brown.
Add broccoli, carrot, and bell pepper to the pan.
Pour the reserved marinade over the chicken and vegetables.
Cover the pan and let it simmer for 5-7 minutes.
Prepare jasmine rice according to package instructions.
Serve the chicken and veggies over rice, garnished with sesame seeds and green onions.