Put chicken fillet in bowl and add soy sauce, granulated seasoning, black pepper and oyster sauce.
Mix the ingredients well until the chicken is coated with the marinade. Marinate the chicken fillet for 30 minutes.
Soak the pancit miki in hot water and try to loosen it using a pair of tongs. Then let it stand for ten minutes and drain.
Heat 1/2 cup of cooking oil in a wok or pan. Add the marinated chicken and stir fry for 5 minutes. When cooked, remove from pan and set aside.
In the same pan, add the bok choy and stir fry for 2 minutes and set aside.
In the same pan, add the garlic and saute until fragrant. Add the onion and saute until soft.
Add the pancit miki and stir for a few seconds. Add soy sauce, sugar, black pepper, chicken powder and oyster sauce.
Toss the noodles until well coated with the condiments. Toss until the noodles are cooked.
Add the cornstarch slurry and stir until the sauce is thick. Then add the chicken pieces and bok choy then toss with the noodles.
Turn off heat and serve hot.