In a large bowl combine all of the marinade ingredients and whisk together.
Place chicken in a gallon freezer bag and pour the marinade over it. Seal container and place in refrigerator to marinate for 4 hours.
Cook chicken to an internal temperature of 165 degrees You can cook the chicken by grilling it, baking it at 400 degrees F for approximately 20 minutes, or cooking it in a skillet over medium high heat for 15-20 minutes.
Once the chicken is cooked through cut into thin slices.
Divide chicken, red onion, cucumber, tomato, olives, feta cheese, and tzatziki sauce between 4 bowls.