For the slaw: Toss together the peanuts, cilantro, chiles, mango, papaya and scallions in a large mixing bowl.
For the vinaigrette: Whisk together the vinegar, honey, fish sauce, chili powder, mustard, lime zest and lime juice in a small mixing bowl. Continue whisking while slowly adding the oil until combined. Season with salt and pepper.
Drizzle the vinaigrette over the slaw and toss to combine. Garnish with additional peanuts and cilantro, with a dash of chili powder on top.