Follow these step-by-step instructions to prepare your shaved Brussels sprout salad with creamy maple dressing:

1. Prepare Brussels Sprouts: Trim the ends of the Brussels sprouts and shave them thinly using a sharp knife or a mandoline slicer. Place them in a large salad bowl.
2. Toast Nuts (if using): In a small skillet over medium heat, toast the pecans or walnuts for about 5-7 minutes until fragrant. Stir frequently to avoid burning. Remove from heat and let cool slightly before adding to the salad.
3. Add Fruits and Vegetables: Dice the apple and thinly slice the red onion. Add both to the bowl with the shaved Brussels sprouts, along with the dried cranberries and feta cheese (if desired).
4. Make the Dressing: In a separate mixing bowl, whisk together the mayonnaise, apple cider vinegar, maple syrup, Dijon mustard, and salt and pepper until smooth and creamy.
5. Combine Salad and Dressing: Drizzle the creamy maple dressing over the salad. Toss gently to combine, ensuring all ingredients are coated with the dressing.
6. Season: Taste the salad and adjust the seasoning with additional salt and pepper, if necessary.
7. Serve: The salad can be served immediately, but for best flavor, let it sit for about 10-15 minutes for the flavors to meld.