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Butterfly the chicken breasts by cutting through the thickest part of the breast, stopping 1cm before the edge, then opening out like a book. Whisk together the lemon juice, olive oil, chilli flakes and garlic. Pour half over the chicken and marinate for 15 mins.
Meanwhile, put the couscous and sultanas in a bowl, then pour over the stock. Cover the bowl with cling film and leave for 5 mins.
Heat a griddle or non-stick frying pan, remove the chicken from the marinade and cook for 4 mins on each side until golden and cooked through.
Fluff up the couscous with a fork and stir in the olives, chickpeas, parsley and the other half of the marinade. Season and serve with the chicken.