Cook the noodles according to the packet instructions. This should take around 5 minutes.
While the noodles are cooking, spray the wok with low-calorie cooking spray and set on a medium heat. Add the chicken and cook for 3 minutes, until browned on all sides.
Add the peppers and continue to cook for 2 minutes.
To a bowl, add the harissa, soy sauce, honey, garlic, ginger, and lime juice. Mix the cornflour with 1 tsp of water and add to the bowl. Pour into the pan, along with the mange tout, and fry for a further 2 minutes.
Drain the noodles well and add to the pan along with the pak choi. Fry for 3 minutes, until the sauce has reduced and coated the vegetables and noodles.
Sprinkle over the red chilli, then serve!