In a large mixing bowl, season the chicken pieces with salt, black pepper, cumin, oregano, and paprika.
Heat olive oil in a skillet over medium heat. Brown the chicken pieces for about 5 minutes on each side, then transfer them to the slow cooker.
In the same skillet, add chopped onion, bell pepper, and garlic. Sauté for about 3-4 minutes until the vegetables are softened.
Add the chopped tomatoes, tomato sauce, chicken broth, and chickpeas to the slow cooker, mixing well to combine.
Place the bay leaf on top, cover, and set the slow cooker to low for 4 hours, or until the chicken is tender and fully cooked.
Once done, remove the bay leaf and adjust seasoning if needed.
Serve hot, garnished with fresh cilantro.