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To make the sauce, in a small bowl, mix the soy sauce, oyster sauce, cornflour and water until smooth. Set aside.
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Heat a film of oil in a large frying pan or wok over medium-high heat. Add the chicken, season with salt and pepper, and stir-fry for 6–7 minutes until golden and just cooked through. Transfer to a plate.
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In the same pan, add the onion and mushrooms. Cook for 4–5 minutes until softened and lightly browned. Add the garlic and stir-fry for 1 minute.
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Return the chicken to the pan. Pour in the sauce and stir-fry for 2–3 minutes, until everything is coated and the sauce has thickened slightly.
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Divide the rice and stir-fry between shallow bowls and sprinkle with spring onions.