Pre-heat oven to 200°C / 180°C fan assisted / gas mark 6 / 400°F.
Prepare the sauce by whisking together the chicken stock, tamari, tomato ketchup, honey, Worcester sauce and garlic.
Whisk together the cornflour and the spices and seasonings in a medium sized shallow bowl.
Use a meat mallet to flatten the chicken to an even thickness, about 3cm (1½ inches).
Drag the chicken through the flour mix, make sure each breast is well coated.
Heat the olive oil in a large skillet to a medium heat.
Cook the chicken for 2-3 minutes each side until golden. Depending on the size of the pan you may need to do this in batches.
Once the chicken has been pan fried, place in an oven proof dish so they are all pretty much in an even layer. Pour over the sauce and bake for 15-18 minutes. Halfway through cooking, remove from the oven and baste the chicken with the sauce. The chicken is fully cooked when the internal temp of chicken is 75°C (167°F) in the thickest part.
Remove from oven and rest for 5 minutes before serving.