01 - Whisk together olive oil, lemon juice, minced garlic, cumin, coriander, smoked paprika, turmeric, cinnamon, cayenne pepper, salt, and black pepper in a large mixing bowl until thoroughly combined.
02 - Add chicken thighs to the bowl and turn to coat evenly with the spice mixture. Cover tightly and refrigerate for at least 1 hour, or up to 12 hours for maximum flavor penetration.
03 - Preheat oven to 425°F or heat a grill pan over medium-high heat. Line a baking sheet with aluminum foil if oven-roasting.
04 - Arrange marinated chicken on the prepared baking sheet or grill pan. Cook for 18 to 20 minutes, turning once halfway through, until chicken reaches 165°F internally and develops slight charring.
05 - Transfer cooked chicken to a cutting board and let rest for 5 minutes to retain juices. Slice thinly against the grain for optimal tenderness.
06 - Combine Greek yogurt, minced garlic, lemon juice, and salt in a small bowl. Whisk in 1 to 2 tablespoons water until sauce reaches drizzling consistency.
07 - Warm pita breads briefly. Fill each with lettuce, tomatoes, cucumber, red onion, pickles, and sliced chicken. Drizzle generously with prepared garlic sauce, roll or fold, and serve immediately.