How big is the chicken?20 mins per 450g + an extra 20 mins. Check it 10-15 mins before you think it should be ready - its cooked when you stick a fork in and the juice that runs out looks ckear, not at all pink.
Sunflower oil fine.
What we do is pour a little of the juice on top of the granules and mix to a paste, then add boiling water. Then micro for 1 min to bring it back to the boil and get juices absorbed. HTH. And as long as chicken is cooked properly (juice clear, not pink) you won't get ill.