Prepare the chicken breast by slicing it into thin strips.

In a large pan or wok, heat the sesame oil over medium-high heat.

Add the chicken strips and cook until browned and cooked through.

Add the bell peppers, carrots, and green onions to the pan and stir-fry for a few minutes until the vegetables are tender.

Add the bean sprouts and chow mein noodles to the pan.

In a small bowl, mix the soy sauce, oyster sauce, and cornstarch slurry, then pour it over the mixture in the pan.

Stir everything together until evenly coated and heated through.