To make the thyme butter, place the butter in a microwave safe dish and using the microwave setting, cook on 600W for 30 seconds. Remove from oven, add thyme leaves, season well with salt and pepper and mix until smooth.
Using your fingers, carefully loosen the skin away from the breast of the chicken and push the thyme butter mixture under the skin. Careful not to puncture the skin.
Place the chicken breast side down onto a lightly greased ovenproof dish. Brush with 1 tablespoon of balsamic and season with salt and pepper.
Place the oven proof dish onto the wire rack in the lower shelf position.
Cook on Combi 9 with the weight 1800g selected.
Turn chicken over when prompted and brush with 1 tablespoon of balsamic vinegar.
When time reaches 15 minutes, add grapes to the dish and drizzle over remaining balsamic vinegar.
Remove from oven when finished and rest for 5 minutes before serving.