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Preheat the oven to 210°C fan bake. Line a large roasting tray with baking paper.
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Add the potatoes and carrots to the tray with a drizzle of sesame and other oil. Toss well, spread out and roast for 15 minutes.
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Meanwhile, mix the gluten-free soy sauce, gluten-free oyster sauce, honey, rice vinegar, crushed garlic, ginger, sesame oil and tomato paste in a large bowl.
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In a small cup, mix the cornflour with the water, then stir this into the sauce.
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Add the chicken, capsicum, zucchini and red onion to the large bowl and mix well to coat everything evenly. Drizzle over the remaining oil then spread the chicken and vegetables over the par-baked potatoes and carrots, then pour over most of the sticky sauce, reserving a couple of tablespoons for glazing at the end. Toss everything together so the chicken and vegetables are well coated.
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Return to the oven and bake for 20–25 minutes, turning once halfway through, until the chicken is cooked through and the vegetables are tender. Brush or spoon over the reserved sauce, then bake for a final 3–5 minutes until glossy and sticky. Scatter with sesame seeds and spring onions.