Remove the skin from the chicken. Heat the oil in a flameproof casserole. Add the chicken, in batches, if necessary, and cook over a medium heat, turning occasionally for 8 - 10 minutes or until golden. Transfer to a plate with a slotted spoon.
Add the onion, garlic, long-grain rice and about 2fl oz/50ml of the stock to the casserole and cook, stirring, for 5 minutes, or until the onion is softened. Pour in the remaining stock and add the tomatoes and their juices and the herbs.
Return the chicken thighs to the casserole, pushing them down into the rice. Bring to the boil, then reduce the heat, cover and simmer for 25-30 minutes or until the chicken is cooked through and tender. Stir in the olives and sprinkle the cheese on top. Garnish with oregano sprigs and serve immediately.
I want to encourage youngsters (male or female) to get into the kitchen and enjoy cooking. TASTE it!