Wash the squash. Use a large, sharp knife to slice off the stems. Cut the squash in half lengthwise. Use a spoon to scoop out the seeds and string. Discard. Set the squash cut-side-up on a baking sheet.
Put a dab of butter in the center of each squash. Drizzle the maple syrup into the cavity of each one. Sprinkle salt and freshly ground black pepper over the flesh of the squash. Set a small sprig of thyme or sprinkle the dried thyme in each half.