Finely chop cucumber, tomato, onion, and Cheongyang chili pepper.
Boil the chicken breast, let it cool, and shred it into bite-sized pieces.
Add the prepared vegetables and shredded chicken breast into a bowl.
Add sweet chili sauce, lime juice, minced garlic, pepper, and salt, then mix well.
Transfer to a plate and finish by topping with cilantro and peanuts.