Preheat the oven to 350 f.
In a deep skillet fitted with tight lid, arrange the ingredients as follows: chicken breasts, peppers, onion, garlic, cilantro, chili and diced tomatoes.
Pour the broth and season with salt and pepper to your taste.
Mix to combine, then place the lid on.
Bake in the preheated oven for about 40-45 minutes until chicken is cooked through.
When the chicken is done, shred with two forks and mix into the sauce.
Assemble lettuce wraps, top with mango and avocado slices and serve.