Take a large ziploc bag, place the chicken drumstick in.
Pour buttermilk, chilli powder, cumin powder, salt, sugar, ginger garlic paste, pepper, oil into the bag.
Shake the bag to mix well. Now place this in fridge to marinate overnight or 3-4 hours.
Preheat the oven to 200 Degree C / 400 Degree F.
Next day. Foil line a baking tray and spray some oil over it.
Arrange the chicken pieces on the tray leaving space between them.
Bake it in the oven for 30 mins. Remove the tray from the oven and flip them over. Now cook it for 15 more mins or it is nicely browned and cooked all the way through.
Remove them from oven and allow it to cool down for 5 mins.