Prepare the marinade for the chicken. Process the ginger, garlic, chilis, shallots, oyster sauce and soy sauce to a paste. You can use a mortar and pestle, a blender or a food processor.
Rub the paste all over the chicken pieces. Leave to marinate for a couple of hours in the fridge. If you have the time, let the chicken marinate overnight.
Preheat the oven to 375F.
Arrange the chicken pieces on a rack and roast for 25 to 35 minutes.