Low calorie cooking spray
Salt and freshly ground black pepper
12 large skinless chicken thighs
600g Desirée potatoes, peeled and cut into 2.5mm thick slices
800g medium vine tomatoes, halved
2 courgettes, thickly sliced
3 large onions, peeled and thickly sliced
4 garlic cloves, peeled and finely chopped
4-5 small rosemary sprigs
4tbsp finely chopped fresh parsley
1tsp dried red chilli flakes
Finely grated zest and juice of 1 lemon
250ml chicken stock