01 - Make shallow diagonal cuts on both sides of each chicken thigh using a sharp knife to help the marinade penetrate deeply into the meat.
02 - Whisk together the Greek yogurt, lemon juice, vegetable oil, minced garlic, grated ginger, cumin, coriander, paprika, turmeric, garam masala, cayenne pepper, and salt in a large bowl until thoroughly combined and smooth.
03 - Add the scored chicken thighs to the bowl with the marinade, turning pieces to coat evenly on all sides. Cover tightly and refrigerate for at least 4 hours, preferably overnight for maximum flavor development.
04 - Prepare grill to medium-high heat, approximately 400°F. Lightly oil the grates to prevent the chicken from sticking during cooking.
05 - Remove chicken from the marinade, allowing excess to drip off. Place on the preheated grill and cook for 6 to 8 minutes per side, until nicely charred at edges and internal temperature reaches 165°F when tested with a meat thermometer.
06 - Transfer grilled chicken to a clean platter and let rest for 5 minutes, allowing juices to redistribute throughout the meat for optimal tenderness.
07 - Arrange chicken on a serving dish and accompany with fresh lemon wedges and generous sprinkling of chopped cilantro.