Using a meat tenderizer, pound the chicken flat so it's about ¼ inch in thickness.
Add all the marinade ingredients, garlic, apple cider vinegar, lemon juice, olive oil, greek yogurt, oregano, cumin, paprika, salt, pepper, seasoning salt, and greek seasoning into a mixing bowl and whisk to combine.
Pour the marinade into a large ziptop bag and then add the chicken. Massage everything around to cover every part of the chicken. Put this in the refrigerator for at least 2 hours to marinate, longer is better.
Once the chicken has finished marinating, remove the chicken from the marinade and you can toss the rest of the marinade.
Place the chicken into a large skillet with a tablespoon of oil.
Place heat on medium and cook the chicken for 3-4 minutes, making sure to sear the chicken as it cooks. Then flip the chicken and continue cooking until it's thoroughly cooked or until it reaches an internal temperature of 165 degrees F.
Place cooked chicken on a cutting board and let it rest for at least 5 minutes before cutting it up into lengthwise strips.
Prep your pita wraps by warming them up slightly so they are nice and pliable before filling them with chicken, toppings, and tzatziki sauce.