Start by slicing the boneless skinless chicken breasts into thin strips. This allows for even cooking and helps the chicken absorb the flavors of the sauces.
In your wok or skillet, heat 2 tablespoons of olive oil and 2 teaspoons of sesame oil over medium-high heat. The combination of these oils adds depth and flavor to the stir fry.
Add the sliced chicken to the hot oil. Stir-fry for about 5-7 minutes, or until the chicken is cooked through and no longer pink. Remove the chicken from the pan and set it aside.
In the same pan, add the celery, carrot, red pepper, shiitake mushrooms, broccoli florets, baby corn, and green onions. Stir-fry the vegetables for about 4-5 minutes until they are tender-crisp.
Return the cooked chicken to the pan with the vegetables. Mix well to combine.
Pour in the teriyaki sauce, soy sauce, and chili sauce. Stir everything together, allowing the chicken and vegetables to absorb the delicious flavors. Cook for an additional 2-3 minutes.
Add the bean sprouts and stir-fry for another minute. To finish, sprinkle with sesame seeds and season with pepper to taste.