01 - With a sharp knife, cut deep slashes into each chicken piece to facilitate marinade infusion.
02 - In a large bowl, whisk together Greek yogurt, lemon juice, vegetable oil, ginger-garlic paste, chili powder, cumin, garam masala, turmeric, ground coriander, salt, and chopped green chili if a higher level of spice is desired.
03 - Add chicken thighs and drumsticks to the marinade and coat all pieces evenly. Cover and refrigerate for a minimum of 4 hours, overnight preferred, to develop flavor.
04 - Heat grill to medium-high or set oven broiler to high. Lightly oil the grill grates to prevent sticking.
05 - Remove chicken from marinade, allowing excess to drip off. Grill chicken for 5 to 7 minutes per side, turning as needed, until the exterior is charred and an internal temperature of 165°F (74°C) is reached.
06 - Let chicken rest for 5 minutes off the grill. Present hot, garnished with lemon wedges, sliced red onions, and fresh cilantro.