Clean and cut 1 kg of chicken into medium-sized pieces. Make deep slits on the chicken pieces to allow the marinade to penetrate well.
In a large bowl, mix 200 grams of thick yogurt, 2 tablespoons of ginger-garlic paste, 1 tablespoon of red chili powder, 1 tablespoon of garam masala, 1 tablespoon of coriander powder, 1 tablespoon of cumin powder, 1 tablespoon of kasuri methi, juice of 1 lemon, and salt to taste. Mix well to form a smooth marinade.
Add the chicken pieces to the marinade, ensuring they are well coated. Cover and refrigerate for at least 4 hours, preferably overnight.
Preheat a tandoor or oven to 200°C. Skewer the marinated chicken pieces onto metal skewers or wooden skewers soaked in water.
Cook the chicken in the tandoor or oven for 25-30 minutes, turning occasionally and basting with melted butter or oil, until the chicken is cooked through and slightly charred on the edges.
Remove the chicken from the skewers and serve hot with mint chutney, onion rings, and lemon wedges.