First of all, you have to preheat the oven to around 350 degrees F. After that, place the chicken pieces in a large casserole dish. Then, put all the curry sauce ingredients in a blender or a food processor and mix them well.
Pour the curry sauce on the chicken pieces. Now, add the chopped eggplant along with kaffir lime leaves and cinnamon stick. Mix all the ingredients well with each other. Bake them for around 45 minutes in the oven.
Take the dish out of the oven and add tomato along with bell pepper in it. Keep stirring the mixture and then place it in the oven again for around 20 minutes. In order to check the balance of flavours, taste the curry. After that, add salt or lemon juice. Then, add brown sugar along with coconut milk. You can also add chillies and crushed cayenne pepper if you want.
Take the serving bowl and put the curry in it. Sprinkle coriander and serve with Thai jasmine rice. Enjoy your meal.