Set the oven to 190°C. Chop the onion, chilli and garlic.
Heat some oil in a large casserole dish and cook the chicken pieces until golden, then set aside.
Add the remaining oil to the pan and gently fry the onion for 5 minutes, then add the garlic, spices, chilli and rice. Stir-fry for a minute, then return the chicken pieces and pour over the stock.
Cover with lid or foil and bake for 20 minutes in the oven. Check after 10 minutes of cooking - if it’s getting dry, add more stock.
Remove the dish from the oven and add the frozen vegetables. Bake for another 10 to 15 minutes under cover.
Add the chopped herbs just before serving