No need to preheat oven.
Place chicken thighs in the roasting bag with the onion and season with dry KNORR mixture.
Hold the bag closed and gently massage KNORR mixture into chicken and onion on a stable surface.
Add the tomatoes, white wine, olives, anchovies, sugar and Robertsons Sweet Basil and close bag at end with blue tie supplied.
Bake at 180°C for 50 minutes on the lowest shelf in the oven. Ensure that the grill is off at all times. Keep enough room for the bag to expand (bag must not touch the sides of the oven).
Carefully cut the bag open and transfer to a serving dish with any remaining sauce that is in the bag.