Make the dressing: Combine the olive oil, maple syrup and cider vinegar in a small bowl. Whisk in the mustard, and set aside.
Prep the kale: Rinse and thoroughly dry the kale. Thinly slice the kale, discarding the stems.
Toss kale with dressing: Place the sliced kale in a salad bowl along with the cranberries. Sprinkle with a pinch of salt, and toss with 2 tablespoons of the dressing. Let the kale sit for 10 to 15 minutes to absorb the dressing and soften.
Finish the salad: Add the feta cheese to the salad, if using, and toss with 1 more tablespoon of the dressing. Place the apple slices on top of the salad, and sprinkle with the seeds. Enjoy!
Notes
You can use pumpkin seeds or sunflower seeds; or use a combination as we did.
Double the recipe if you want to use a whole apple.
Apple slices go nicely with cheddar cheese if you want to serve that as an appetizer to use the other half of the apple.