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Heat the oven to 200C/180C fan/gas 6. Toss the peppers, courgettes and red onion wedges together in a roasting tin along with the rapeseed oil, and roast for 15 mins. Tip in the cherry tomatoes, ras el hanout, oregano, harissa, preserved lemon and chickpeas, and toss to combine. Cut deep slits into the top of the halloumi, about halfway down, in a criss-cross pattern. Nestle the halloumi among the veg in the tin and roast for a further 15-20 mins until the cheese is lightly golden and the veg is tender.
Scatter over the parsley, then drizzle over some yogurt just before serving.