1. Blend the tomatoes, red bell peppers, and onion until smooth.
2. Heat the vegetable oil in a large pot over medium heat. Add the minced garlic and sauté until fragrant.
3. Add the blended tomato mixture to the pot and cook for about 10 minutes, stirring occasionally.
4. Stir in the tomato paste, thyme, curry powder, salt, and black pepper. Cook for another 5 minutes.
5. Add the chicken pieces to the pot, ensuring they are well coated with the sauce. Cover and simmer for 45 minutes, or until the chicken is cooked through.