Place the prepared kale leaves into a large mixing bowl.
Add the avocado, olive oil, lemon juice, salt, and pepper to the bowl with the kale.
Use clean hands to firmly massage the avocado and oil into the kale leaves for 3 to 5 minutes.
Continue massaging until the kale leaves have reduced in volume, turned a darker green, and softened in texture.
Add the toasted sunflower seeds and dried cranberries, then toss gently to distribute.
Top with shaved Parmesan cheese and serve immediately or refrigerate for up to 24 hours.