Heat the oil in a broad non-stick pan and add the onions and saute on a medium flame till translucent, this will take about 1-2 minutes.
Add the vegetables and chicken and saue on a medium flame for 2 to 3 minutes.
Add salt and white pepper.
Mix all the sauce ingredients and add to the above and let it boil for about 1-2 minutes till it thickens slightly.
Heat oil for frying in a deep pan, when it heats lower the flame and add noodles little by little and fry till they turn golden brown. Be patient and don't increase the flame if you want nice and crisp noodles. The frying of one batch will take around 3-4 minutes.
Let the fried noodles completely cool and before serving add the prepared sauce over them. Enjoy hot.