01 - With a sharp knife, create deep incisions in each chicken piece to facilitate marinade absorption.
02 - In a large mixing bowl, combine Greek yogurt, lemon juice, vegetable oil, ginger-garlic paste, chili powder, ground cumin, garam masala, turmeric, ground coriander, salt, and chopped green chili. Whisk thoroughly until homogeneous.
03 - Submerge chicken thighs and drumsticks in the marinade, ensuring all surfaces are coated evenly. Cover and refrigerate for no less than 4 hours, preferably overnight, for optimal flavor development.
04 - Preheat grill to medium-high heat or set oven broiler to high. Lightly brush grill grates with vegetable oil to prevent sticking.
05 - Remove chicken from marinade, letting excess drip off. Place chicken onto grill and cook for 5 to 7 minutes per side, turning periodically, until exterior is well charred and internal temperature reaches 165°F (74°C).
06 - Transfer grilled chicken to a plate and allow to rest for 5 minutes. Serve hot accompanied by lemon wedges, sliced red onions, and fresh cilantro leaves.