Cut defrosted or fresh skinless, boneless chicken breast into bite size pieces and cook in oil in a large saute pan until the chicken is cooked through.
Add the chopped onions and peppers to the saute pan with the chicken and cook on medium heat for 3-4 minutes.
Add Teriyaki Marinade and stir to coat the chicken and vegetables with the sauce.
Reduce heat to low and cook until sauce thickens a bit.