01 - Score the chicken pieces with deep cuts using a sharp knife to allow full penetration of the marinade.
02 - In a large mixing bowl, whisk together Greek yogurt, lemon juice, vegetable oil, ginger-garlic paste, chili powder, ground cumin, garam masala, ground turmeric, ground coriander, salt, and chopped green chili if desired.
03 - Place the chicken into the marinade, coating each piece thoroughly. Cover the bowl and refrigerate for a minimum of 4 hours or overnight for maximum flavor development.
04 - Heat grill to medium-high or prepare oven broiler. Lightly oil the grill grates to prevent sticking.
05 - Remove chicken pieces from marinade, letting excess marinade drip off. Grill each piece for 5 to 7 minutes per side, turning occasionally, until charred, aromatic, and internal temperature reaches 165°F (74°C).
06 - Allow the grilled chicken to rest for 5 minutes. Serve hot with lemon wedges, sliced red onions, and fresh cilantro leaves.