Heat oil in a pan/skillet. Add the chicken pieces into the pan and saute for 2-3 minutes.
Next, add the onions and saute for a minute.
Add the broccoli florets next and saute for 2 minutes.
Next add in the mushrooms and saute for 2 minutes.
While the veggies are cooking, prepare the sauce. Take a mixing bowl and add the light soya sauce, vinegar, brown sugar, red chili flakes, and ginger garlic powder. Mix well.
Add the prepared sauce to the pan with the chicken and veggies and mix well.
To adjust the consistency of the sauce, prepare a corn flour slurry by mixing corn flour and water. Add the slurry into the pan and mix well. Make sure there are no lumps.
Adjust the seasoning if required.
Garnish with chopped spring onions and serve hot with rice of your choice.