01 - Whisk together olive oil, lemon juice, minced garlic, cumin, coriander, smoked paprika, turmeric, cinnamon, cayenne pepper, salt, and black pepper in a large bowl until thoroughly combined.
02 - Add chicken thighs to the bowl, turning to coat completely with the spice mixture. Cover and refrigerate for at least 1 hour, or up to overnight for maximum flavor infusion.
03 - Preheat oven to 425°F or heat a grill pan over medium-high heat.
04 - Arrange marinated chicken on a foil-lined baking sheet or preheated grill pan. Roast or grill for 18-20 minutes, turning once halfway through, until chicken is fully cooked and displays slight charring.
05 - Allow cooked chicken to rest for 5 minutes to retain juices, then slice into thin strips against the grain.
06 - Combine Greek yogurt or tahini, minced garlic, lemon juice, and salt in a small bowl. Add water gradually, 1 tablespoon at a time, until sauce reaches drizzling consistency.
07 - Warm pita breads. Fill each with shredded lettuce, diced tomatoes, cucumber slices, red onion, and pickles if desired. Add sliced chicken and drizzle generously with prepared sauce. Roll or fold pita and serve immediately.