In a blender, add fresh coriander leaves, mint leaves, ginger paste, garlic paste, and green chilies. Blend until you get a smooth paste.
In a mixing bowl, add the chicken pieces and the green paste. Mix well, making sure that the chicken is coated with the marinade. Let it rest for 30 minutes.
In another bowl, whisk hung curd until smooth. Add gram flour, cumin powder, coriander powder, garam masala powder, and salt. Mix well.
Add the chicken pieces to the marinade and mix well.
Preheat the oven to 200°C. Arrange the chicken pieces on a baking tray, drizzle some oil on top, and bake for 15-20 minutes or until the chicken is cooked through.
Alternatively, heat oil in a pan, and cook the chicken pieces on a medium flame until they are cooked through.
Serve hot with lemon wedges and mint chutney.