Preheat oven to 180°C (160° fan-forced). Combine chicken, dried oregano, lemon rind and garlic in a small bowl. Toss well to coat and set aside to marinate for 10 minutes or overnight if you have time.
Heat oil in a large shallow casserole pan over medium heat. Add chicken and cook for 4 minutes each side, until golden. Transfer to a plate and set aside.
Add onion and cook for 6-8 minutes, stirring until softened and golden. Add the rice and stir to combine, then the stock and lemon juice. Place chicken back on top of the rice.
Bring to a simmer, cover with a lid. Place in the oven and bake for 30 minutes, until rice is tender. Set aside, covered, for 10 minutes.
Sprinkle over the olives and oregano and fluff with a fork.
