Season the chicken pieces with salt, pepper, and half of the minced garlic. Let it marinate for about 30 minutes.
In a large pot, heat the vegetable oil over medium heat. Add the chopped onions and sauté until they become translucent.
Add the remaining minced garlic and grated ginger to the pot. Stir and cook for another minute.
Add the marinated chicken pieces to the pot and brown them on all sides.
Stir in the tomato paste, diced tomatoes, and hot peppers. Cook for a few minutes until the tomatoes break down and release their juices.
Add the diced eggplant, green bell pepper, and red or yellow bell pepper to the pot. Stir everything together.
Pour in the chicken broth and sprinkle in the thyme and curry powder. Season with salt and pepper to taste.
Cover the pot with a tight-fitting lid and reduce the heat to low. Let it simmer for about 1 to 1.5 hours, or until the chicken is tender and the flavors have melded together.
Give it a gentle stir occasionally, making sure the ingredients are well distributed.
Serve the Kedjenou hot with rice, attiéké, or fufu.