Add salt, white pepper powder, Chinese five spices powder and chicken powder in a small mixing bowl. Mix it well and set aside.
Prepare all the vegetables buy cut the onions, peppers, spring onion and chilli into thin slices. Finely chop the garlic and set aside.
To deep fry the chips, heat the vegetable oil to high heat about 350° F and fry the chips until crispy but make sure not to over-cook. ( Or you can fry it according to the package instructions. If you wish to bake or air fry it, spray a bit oil on the chips to achieve a crispy nice golden colour and texture. )
Remove from oil and transfer to paper towel and set aside.
In a large wok or pan, heat a tablespoon of vegetable oil over medium heat. Add onion slices and stir for few seconds and follow with the chopped garlic.
Stir for few seconds and add bell pepper, chilli slices and crush chilli flakes. Place the fried chips back in, sprinkle the seasoning powder mix. Toss all ingredients evenly for 1-2 minutes.
Add sliced spring onions and mix well.
Remove from heat and transfer to serving plate. Serve immediately.