Cut squash in half lengthwise; discard seeds. Brush squash halves with butter. In a small bowl, combine the salt, cinnamon, nutmeg and pepper; sprinkle over squash halves. Place 2 teaspoons brown sugar in each half. Sprinkle remaining brown sugar over cut sides of squash.
Place in an 11-in. x 7-in. baking dish coated with cooking spray. Cover and bake at 350° for 40 minutes. Uncover; bake 15-25 minutes longer until squash is tender. Yield- 6 servings