Take out the bowl from the refrigerator. Add yogurt, cornstarch, mustard oil, tandoori masala powder, Kashmiri red chili powder, turmeric powder, garam masala powder, and black pepper powder to the bowl and mix well to coat the chicken pieces.
Return the tray to the oven and grill for another 10-12 minutes. Increase the oven temperature to 420 Degrees F and broil the skewers for 3-4 minutes until they are slightly charred. Remove the tikka from the oven and serve hot.