Combine the chicken and all remaining marinade ingredients in a large bowl. Coat the chicken evenly and cook immediately, or allow it to marinate for up to 24 hours for a deeper flavour.
Heat a large pan on medium-high heat. Add the chicken and cook for 10 minutes (or until golden and cooked through), turning once halfway. Add 60ml of water halfway if the pan gets too sticky. Allow the chicken to rest for 5 minutes before serving.
Serve the chicken on pita bread with tzatziki, tomato, red onion, parsley and kalamata olives.