01 - Add walnuts to a dry skillet set over medium heat. Stir frequently and cook for 3 to 4 minutes until the nuts are aromatic and lightly browned. Remove from the pan and allow to cool.
02 - Place shredded kale in a large mixing bowl. Drizzle with a teaspoon of olive oil and add a pinch of salt. Using your hands, massage the kale for 1 to 2 minutes until the leaves are tender and deepen in color.
03 - Add sliced apples, cooled toasted walnuts, dried cranberries, crumbled feta cheese if desired, and red onion to the bowl with the kale.
04 - In a small bowl or jar, whisk together extra virgin olive oil, pure maple syrup, apple cider vinegar, Dijon mustard, salt, and black pepper until emulsified.
05 - Pour the maple vinaigrette over the salad ingredients and toss thoroughly to ensure even distribution.
06 - Serve immediately, or refrigerate for 10 minutes to allow flavors to meld before serving.