First, season the chicken slices with corn starch, sesame oil, sugar, baking soda, soy, white pepper. Mix together and let it marinate for minimum 15 minutes.
Add all the stir fry sauce ingredients in a small bowl. Mix it well and set it aside.
Heat the large wok/pan over medium-high heat. Drizzle 2 tablespoons of oil, then add marinated chicken slices and stir fry for 2-3 minutes or until the chicken is cooked through.
Push the chicken to one side of wok, drizzle a bit more oil, add chopped garlic and ginger strips and stir fry for 1 minute until the ginger strips start to crisp up. Then, follow with the onion slices, chillies, and white part of spring onions.
Next, pour the stir fry sauce and cook until the sauce become thick and glossy. Add a bit of water if you like a runnier consistency.
Turn off the heat, stir in green part of spring onions and transfer to serving plate. Serve with steamed rice and your favourite chilli oil.