While squash is roasting, shave all of the the Brussels sprouts - Hold the Brussels sprouts by the stem on a cutting board, and use a sharp knife to carefully chop (or shave) them into thin slices. Discard the hard stems.
Add the shaved Brussels sprouts to a large serving bowl, along with the butternut squash, apple, pomegranate seeds, feta cheese, and pumpkin seeds. Toss in desired amount of dressing until everything is well coated. Taste for flavor and add sea salt to taste.