In a large bowl, combine brussels sprouts, kale leaves, onion, bacon and apples.
In a separately, small bowl combine olive oil, apple cider vinegar, maple syrup and salt and pepper. Whisk thoroughly until well combined.
Pour the maple dressing over the brussels sprouts mixture. Stir well to combine.
Chill in refrigerator for at least 30 minutes before serving. Stir again before serving to re-distribute the dressing.
Notes
If I'm short on time, I wrap the bacon in paper towels and place it on a plate. I then microwave it for 4-6 minutes until crispy. Be careful when removing from the paper towel, it will be hot!