Preheat two tablespoons of oil in a skillet on medium heat. Add the diced onions and cook until translucent. About 1 to 2 minutes.
Add the ground chicken and use a wooden spoon to break it into smaller pieces. Add cayenne pepper, paprika, thyme, salt, black pepper, and one tablespoon of water if necessary.
Cook for another 5 minutes or until the meat is no longer pink. Remove from the pan and set it aside.
Add two more tablespoons of oil to the same pan. Season the sweet potatoes with paprika, salt, and black pepper and add them to the skillet. Stir frequently, about every 2 minutes, until potatoes are tender, about 10 to 12 minutes. You can add 1 to 2 tablespoons of oil, if needed, to prevent the sweet potatoes from burning.
Stir in the bell pepper. Cook for another two minutes, then stir in the cooked ground chicken.
Sprinkle some green onions, parsley, or cilantro over it if desired, and serve hot.