In a bowl, mix olive oil, yogurt, lemon juice, minced garlic, cumin, paprika, turmeric, salt, and pepper.
Add the chicken breasts to the marinade, ensuring they are well coated.
Cover and refrigerate for at least 1 hour, preferably overnight for better flavor.
Preheat your grill or stovetop pan over medium-high heat.
Remove the chicken from the marinade and let excess drip off.
Place the chicken on the grill and cook for about 6-7 minutes per side, or until fully cooked.
Let the chicken rest for 5 minutes before slicing it thinly.
Prepare your pita or flatbreads by warming them slightly.
Layer the sliced chicken with fresh vegetables on the bread.
Drizzle with tahini sauce if desired, and wrap or serve open-faced.