Prepare the Kale: Rinse the kale thoroughly. Remove the stems and finely chop the leaves. If using a salad spinner, spin the kale to remove excess water.
Prepare the Apples: Thinly slice or julienne the apples. To prevent browning, you can toss them in a little lemon juice.
Mix the Vegetables: In a large mixing bowl, combine the chopped kale, sliced apples, shredded carrots, sliced red onion, dried cranberries or raisins, and chopped nuts.
Make the Dressing: In a small bowl, whisk together the olive oil, apple cider vinegar, honey or maple syrup, Dijon mustard, salt, and pepper until well combined.
Dress the Slaw: Pour the dressing over the kale mixture. Toss everything together until the ingredients are well coated with the dressing.
Add Cheese (Optional): If using, sprinkle the feta cheese over the top of the slaw and give it a gentle toss.
Serve: Serve immediately, or let it sit for 10-15 minutes to allow the flavors to meld.