In a bowl, mix the chicken with soy sauce, cornstarch, and sesame oil. Let it marinate for 10 minutes.
Heat vegetable oil in a large pan or wok over medium-high heat.
Add the chicken and cook until browned and cooked through. Remove from the pan and set aside.
In the same pan, sauté garlic and ginger until fragrant.
Add carrots, bell pepper, and cabbage, stir-frying for 2 minutes.
Return the chicken to the pan and add the cooked noodles.
Mix in oyster sauce, hoisin sauce, and soy sauce, stirring to combine.
Garnish with green onions and sesame seeds before serving.