01 - Using a sharp knife, score the chicken thighs and drumsticks with deep cuts to allow marinade absorption.
02 - In a large bowl, thoroughly whisk together Greek yogurt, lemon juice, vegetable oil, ginger-garlic paste, chili powder, ground cumin, garam masala, turmeric, ground coriander, salt, and green chili if desired.
03 - Submerge chicken pieces in the marinade, coat evenly, cover, and refrigerate for at least 4 hours or preferably overnight.
04 - Heat grill to medium-high or preheat oven broiler. Lightly oil the grill grates.
05 - Lift chicken from marinade, allowing excess to drip off. Grill 5 to 7 minutes per side, turning as needed, until charred outside and an internal temperature of 165°F is reached.
06 - Remove chicken from heat and let rest 5 minutes. Plate and accompany with lemon wedges, sliced red onions, and fresh cilantro leaves.