In a large bowl, combine the shredded chicken, cabbage, carrots, cilantro, and mint. Add any optional vegetables like red bell pepper, red onion, mango, or bean sprouts if using.
In a small bowl, whisk together the lime juice, fish sauce, brown sugar, minced garlic, and chili flakes until the sugar dissolves completely. Add optional sesame oil and rice vinegar if using.
Pour the dressing over the salad ingredients and toss thoroughly to coat everything evenly.
Let the salad sit for 5-10 minutes to allow the flavors to meld.
Just before serving, sprinkle with the chopped peanuts and sliced green onions (if using).
Serve immediately for the best flavor and texture.
