1. Roast the Sweet Potatoes: Preheat oven to 425ºF. In a small bowl, whisk together olive oil, maple syrup, cinnamon, cayenne, and salt. Spread sweet potatoes on a baking sheet and pour the maple mixture over top. Toss until well coated. Roast for 25–30 minutes, flipping once halfway through, until tender and caramelized. Set aside to cool slightly.
2. Make the Maple Vinaigrette: In a small bowl, whisk together mustard, maple syrup, vinegar, and tamari. Slowly drizzle in olive oil while whisking continuously until emulsified. Season with salt and black pepper to taste. Set aside.
3. Prepare the Salad Base: Place chopped kale in a large mixing bowl. Drizzle with about half of the dressing. Massage the dressing into the kale for 30 seconds to 1 minute, until the leaves are softened and darkened in color. Add spinach, sliced apple, toasted pumpkin seeds, and gently toss to combine.
4. Assemble and Serve: Add the roasted sweet potatoes and remaining vinaigrette to the bowl. Toss gently to combine all elements and coat evenly with dressing. Top with shaved parmesan if using. Serve immediately.