Roast chicken thighs with red peppers, sweet potatoes, green olives and feta recipe

Name: Roast chicken thighs with red peppers, sweet potatoes, green olives and feta recipe
Cuisine: European, Mediterranean
Ingredients: Timings; Four; 650g sweet potatoes, scrubbed; 6 red peppers, quartered and the seeds and stalks removed; 8 decent-sized chicken thighs, bone in and skin on; 4 tbsp extra-virgin olive oil; 1 tbsp white balsamic vinegar (regular dark balsamic vinegar would do, too); 1½ tsp chilli flakes; 3 garlic cloves, grated to a purée; 60g green olives, pitted and flesh chopped; 100g feta cheese, crumbled; 3 tbsp chopped coriander or parsley, or a mixture of both; Juice of ½ lemon