Cook Greens: Bring a large pot of water to a boil. Add kale and cook for 5 minutes. Add spinach to the pot and continue cooking for 2 more minutes, until greens are all wilted down and bright green. Remove greens from the pot (keep the water in the pot).
Pasta: Bring that same water back to a boil then add pasta. Cook according to package instructions. When finished, strain pasta and reserve a few cups of the pasta water.
Blend: Add cooked greens, 1 cup of pasta water, and all remaining ingredients to a blender. Blend with the lid slightly ajar for 2 to 3 minutes, until smooth. You can add another ladle of pasta water to reach your desired consisentcy. Taste and add more salt if needed.
Serve: Stir sauce into cooked pasta and serve immediately, topped with grated parmesan.
