Cut the chicken breast into bite-sized pieces and marinate with the sauce (chili sauce, soy sauce, etc.)
Cut vegetables such as bell pepper and onion into bite-sized pieces
Heat olive oil in a pan and stir-fry the chicken breast
When the chicken is cooked, add the vegetables and stir-fry together
Add chili sauce and stir-fry everything evenly
Season with salt and pepper to taste
Plate and serve