In a large bowl, combine the shredded cabbage, romaine, carrots, cilantro, mint, and peppers, as well as red onion if you're serving immediately (see notes). Add the shredded chicken as well.
In a smaller bowl, whisk together the peanut butter, coconut milk, soy sauce, lime juice, Sambal or gochujang and brown sugar until smooth. Taste and adjust in case you need to balance it out (sweet, spicy, tart, savory).
Pour the dressing over the salad and toss to fully coat. Taste it and add salt as needed (mine always needs).
Serve immediately. Garnish with chopped peanuts.