Wash the chicken well and drain the water. Add red chillie powder, black pepper powder, salt, 1 tbsn ketchup, 1tbsn soy sauce, 1 tspn olive oil or cooking oil, Vinegar and mix well. Poke the chicken with a fork a bit to make holes for the marinade to seep in. Coat well, cover and refrigerate for 4-5 hours or overnight. After marinating place the chicken in a foil tray and rub them with a little margarine and bake them at 400 F about 30 minutes. Remove from oven and turn the other side remove all the fat and juices that's in the tray.Then place the tray back in the oven for 15 minutes or until well cooked and the sides are brown.