Combine the marinade ingredients with the chicken.
Combine the ingredients for the stir-fry sauce.
Heat the vegetable oil in a wok or large frying pan over high heat. Add the garlic, onion and ginger and stir-fry for half a minute.
Add the chicken and stir-fry until almost cooked.
Add the mushrooms and stir-fry for another half a minute.
Then add the stir-fry sauce you made earlier. Stir-fry until just combined and the chicken is cooked.
Toss through the spring onions. Then remove from heat and serve with steamed rice.
