Add Oil in a Wok (you may use a Karhai)
Add the Onions and stir fry for about a minute
Now add all the vegetable except the Spring onions and stir fry on high heat for about 1-2 minutes
Add the Spring onions in the last 30 seconds, stir well
Now remove the stir-fried vegetables and keep it aside
Now pour the remaining 2 tbsp oil in the Wok/Pan/Karhai and heat it
Add the chopped Garlic and Ginger and sauté for about a minute until fragrant, don't brown it
Add the marinated Chicken and stir fry until the Chicken is cooked completely
Add the Sauce mixture to the Chicken and and stir well
Let the Chicken simmer in the sauce for about 2-3 minutes, don't dry up the sauce
Now turn your flame high and add the noodles to the Chicken
Give the noodles a good mix until it is well coated with the sauce
Now add the Stir fried vegetables and stir fry the noodles on high flame
Toss the noodles so that the stir fried vegetables and the Chicken are evenly mixed
Your Desi Chow Mein is now ready, serve hot