Chicken Chow Fun (Fried Rice Noodles, 鸡肉炒粉)

Name: Chicken Chow Fun (Fried Rice Noodles, 鸡肉炒粉)
Prep time: 20 min
Cook time: 5 min
Total time: 25 min
Cuisine: Chinese
Ingredients: 1 piece chicken breast (about 180g/6.3oz); ½ tablespoon cornstarch, or tapioca starch; 1 pinch salt; 1 tablespoon water; 1 teaspoon neutral cooking oil; 2 portions fresh wide rice noodles (aka Sa-ho Fun), about 400g/14oz (see note 1 for substitutes); 2 tablespoon neutral cooking oil (divided); ½ onion, sliced; ½ bell pepper, sliced (see note 2 for other options); 2 stalks celery, sliced diagonally; 1 tablespoon light soy sauce (see note 3 for gluten free options); 1 tablespoon dark soy sauce; ½ teaspoon sesame oil; 1 stalk scallions, finely chopped