Preheat oven to 200c or 400f (gas mark 6)
Add to a small saucepan over a medium heat the peanut butter, soy sauce, water, coriander, cumin, garlic and chilli powder.
Whisk until you have a smooth sauce.
Add your chicken drumsticks to an oven proof dish and pour over the sauce, making sure the drumsticks get covered in the sauce.
Place in the oven and bake for approx 30 mins. (taking out at several intervals to baste with the sauce)