Spray a large frying pan with low calorie cooking spray and place over a medium heat. Add the onions and garlic to the pan. Cook for 3 minutes until the onions begin to soften.
In a separate saucepan add the noodles and cook according to packet instructions, this should take around 5 minutes.
While the noodles are cooking, add the water, broccoli, mushrooms, ginger and Chinese five spice to the pan and cook for 5 minutes.
Add the oyster sauce, soy sauce, Sriracha, honey, water chestnuts and drained cooked noodles. Stir well and cook for another 5 minutes. When ready the broccoli will be cooked through but still have some bite.
Season with pepper to taste and serve.