Make the coleslaw dressing: In a medium bowl, whisk together the mayonnaise, apple cider vinegar, maple syrup, dill, chili powder, and salt. Keep whisking after the mayo gets lumpy, until the mixture comes to a creamy consistency.
Mix the cabbage, carrots and coleslaw dressing together and serve immediately, or refrigerate until serving. (The coleslaw is best fresh, but can be stored refrigerated for up to 1 day.)