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Preheat the oven to 200°C (fan 180°C).
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Place the sweet potato and red onion in a large shallow roasting dish. Drizzle with half the oil, season with salt and pepper, and toss well. Roast for 20 minutes until starting to soften.
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Meanwhile, combine the soy sauce, honey, oyster sauce, rice vinegar, sesame oil, ginger, garlic and water in a bowl. Add the sauce to the chicken and toss to combine.
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Remove the tray from the oven, add the capsicum, broccoli and green beans. and place the chicken on top of the vegetables. Pour over any remaining sauce, turning everything to coat well.
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Return to the oven and roast for a further 20 minutes, or until the chicken is cooked through and the vegetables are tender and caramelised.
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Serve everything with the sticky tray juices spooned over.