Mix all the stir fry sauce ingredients together in a small bowl and set aside.
Prepare the vegetables by cutting into uniform sizes.
Whisk the stir fry seasoning and cornflour together in a large bowl.
Dice the chicken up into small bite-sized pieces and toss into the seasoning mix.
Heat 1 tablespoon oil in a large frying pan or wok.
Add the chicken in an even layer and cook for 3-4 minutes on each side, over a medium heat, until cooked through. Remove from the pan with a slotted spoon and set aside.
Add the other tablespoon of oil to the pan.
Toss in all the vegetables and fry for 1-2 minutes until slightly softened.
Add the chicken back in, along with the stir fry sauce. Cook for 2 minutes until everything is heated through and the sauce has thickened.
Serve immediately with rice or noodles with sliced spring onions to garnish.