In a bowl, add chicken ,egg, salt, black pepper powder, cornflour, all-purpose flour & mix well, cover & marinate for 15 minutes.
In a wok, heat cooking oil & fry on medium flame until golden & crispy.
In a wok, add cooking oil, garlic, ginger & mix well.
Add green chilies & mix well.
Now add fried chicken, ginger & mix well.
Add soy sauce, chili garlic sauce, oyster sauce, salt, black pepper powder, sugar & mix well.
Add chicken stock, mix well & cook on high flame for a minute.
Add green chilies, ginger, spring onion leaves & mix well.