In a large bowl, whisk together the olive oil, apple cider vinegar, maple syrup, Dijon mustard, salt, and pepper.
Add the chopped kale to the large bowl on top of the vinaigrette. Use your hands to gently massage the kale for a couple minutes until it becomes slightly softer and darker in color.
Add the red onions, dried cranberries, and toasted pecans to the massaged kale and gently toss all the ingredients together until everything is well combined.
Sprinkle the feta cheese on top and serve immediately.