Make the Sauce: Mix all the sauce ingredients in a small bowl.
Cook Aromatic: Heat vegetable oil over high heat in a wok or large pan. Add garlic and onion, Stir-fry for 1 minute.
Add Chicken: Add the sliced chicken. Cook for about 1–2 minutes until the outside changes from pink to white.
Add vegetables: Stir in the white parts of the spring onions, red capsicum, Cashews, and the sliced chili. Stir fry until the chicken is cooked around 2 mins.
Add Sauce: Pour in the sauce. Cook for 2 minutes, stirring, until it reduces to a syrupy consistency and coats the chicken.
Finish with Spring Onions: Add the green parts of the spring onions. Toss for 30 seconds.
Serve: Transfer to a serving dish. Serve with jasmine rice and garnish with extra spring onion and red chilli if desired.
