Preheat oven to 425 degrees (400 degrees convection).
Cut the butternut squash into large chunks and remove the seeds. Place face down onto a parchment paper-lined rimmed baking sheet. Roast for around 1 hour or until tender when fork is inserted into the pieces. Set aside to cool. ALTERNATIVE WHOLE SQUASH ROASTING METHOD HERE In a large skillet, steamfry the onions with a little water until tender and just turning golden. Add in the crushed garlic and cook another 2 minutes. Add in the wine, liquid smoke, and sage. Stir for one more minute. Place mixture in the blender with 1 1/2 cups of the roasted Butternut squash, cashews, miso, broth, salt, and black pepper. Blend until smooth and creamy. Set aside.
Cook the pasta according to package directions. Drain well.
While cooking the pasta, place your chopped greens with 2 T of water in the skillet you used for the onions mixture. Cover and cook for 5 minutes--until just starting to change from bright green to a more dull green color. Add the Butternut squash sauce from the blender into the greens in the skillet and simmer (covered) for a few minutes while you are cooking the pasta.
Add well-drained pasta into the skillet and make sure it is coated thoroughly.
Serve warm with small chunks of the remaining roasted butternut squash on top of the pasta.