Place chopped kale in a large bowl. Drizzle with olive oil and lemon juice. Use clean hands to massage the kale for about 1–2 minutes, until it softens and darkens in color.
Add the sliced apples, chopped pecans, dried cranberries, feta cheese, and sunflower seeds to the bowl.
Drizzle with citrus vinaigrette and toss gently to coat all ingredients evenly.
Serve immediately, or let it chill in the fridge for 10–15 minutes to allow flavors to meld.