Heat oven to 400 degrees.
Season chicken with spices and yogurt, marinate up to overnight if desired or proceed to cooking step right away.
Use two bamboo skewers and slide the halved onion on the bamboo skewers all the way to the bottom to create a base for the chicken.
Add chicken to the skewers so they stand on top of the onion and cook standing up.
Bake chicken for 35 minutes, increase heat to 450 degrees and continue cooking for 15-20 more minutes or until chicken registers 165 degrees internally and juices run clear.
Slice chicken into bite size pieces and discard the onion and skewers.
For salad:
Combine ingredients in a small mixing bowl, season to taste and set aside in the refrigerator until assembly.
For assembly:
Warm a fresh piece of pita bread and add sliced chicken, salad and Tzatziki