In a bowl, marinate the sliced chicken with soy sauce, oyster sauce, and Chinese five spice. Mix thoroughly.

Heat a pan or wok and add the marinated chicken. Stir-fry until it starts to cook.

Sprinkle flour and more spices over the chicken, then continue to stir-fry until the chicken is fully cooked and has a crispy coating. Set the chicken aside.

In the same pan, stir-fry the carrots, celery, onions, and broccoli until they are crisp-tender.

Add bean sprouts to the vegetables and stir. Then, add the cooked chicken back to the pan.

Add the cooked noodles to the pan and toss everything together until well combined and coated in the sauce.

Garnish with freshly sliced spring onions and serve immediately.