1)Increase Chilli powder and Pepper powder for spicier version.
2)You shall grease the aluminium tray with little oil to avoid sticking.
3)Add oil to chicken pieces only just before grilling. Adding oil along with spices will not let the chicken absorb the spices.
4)If using steel rack too, you shall use aluminium foil to cover the baking tray to collect the water let out by chicken, so that tray washing is easier.
5)Before broiling, make sure there is no water in the tray. If any, absorb it with kitchen tissue and then start broil mode. Else, broil mode will cause smoke and your fire alarms will start to shout!
6)Once done, immediately take out the chicken pieces from the baking tray as leaving it longer in the heat might turn the pieces dry and harder.