Dry roast the panch phoron mix for a few seconds. Keep aside to cool and then grind into a fine powder.
Blend the chopped raw mango into a puree. Mix all the ingredients and marinate the chicken cubes in it overnight.
Thread the marinated chicken cubes in the greased skewers and grill for 30-35 minutes in the oven / microwave. Turn it over halfway and baste with the remaining marinade or oil.