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Heat the oven to 200C/180C fan/gas 6. Put the vegetables and garlic on a baking tray. Season well, drizzle with 1 tbsp olive oil and mix until everything is coated.
Sprinkle the spices and some seasoning over the chicken thighs, then rub into the skin and flesh. Drizzle a little oil over the skin and nestle the thighs among the veg. Roast in the oven for 25-30 mins until the vegetables are starting to crisp and the chicken is cooked through.
About 10 mins before the chicken and vegetables are done, put the couscous in a bowl and just cover with boiling water, cover with cling film and set aside for 5 mins.
Fork through the couscous to separate the grains. Toss the vegetables and parsley or mint through the couscous, season, then transfer to a serving plate. Top with the chicken and drizzle over the sweet chilli sauce, if you like.