Aromatic chicken curry

Name: Aromatic chicken curry
Ingredients: 2 tbsp vegetable oil; 1 large onion chopped; 4 tsp garam masala; 1 small cinnamon stick; 2-3 tsp hot chilli powder (depending on how you like your curries); 8 skinless, boneless chicken thighs; 100g creamed coconut (we used 2x50g sachets Bart's creamed coconut); handful of coriander leaves