Cut the chicken into thin strips. Add the strips to a pan with broth. Bring the broth to a boil and cover. Let simmer for 5-7 minutes.
Saut� the onion in oil until tender in a large skillet over medium heat.
Add the tomatoes, peanut butter, chocolate, and chili seasoning mix to the onions and oil. Stir well.
Pour the broth and chicken into the saut� pan while stirring constantly. Let simmer for 10-15 minutes.
Serve with beans, tortillas, rice, and vegetables.