Make the Kale Pesto: Add the kale, walnuts, and garlic to a food processor (or blender). Pulse to break down the ingredients. With the processor on low, add the olive oil. Blend until fully incorporated. Scrape down the sides. Add the parmesan and salt to taste. Blend until smooth. Store leftover pesto in a sealed container in the refrigerator up to a week.
Make the Naan Pizza: Spread 2 tablespoons kale pesto onto each piece of naan. Top with 1 cup kale each, then evenly with the parmesan, chopped walnuts, and red pepper flakes.
Place the naan pizza directly on the oven rack or a sheet pan. Bake 8-10 minutes or until the cheese starts to turn golden brown. Carefully remove from the oven. Slice and enjoy!