Preheat oven to 350°.
Cut a small slice from both ends of squash so halves sit upright. Cut squash in half crosswise; discard seeds and stringy pulp. Place squash halves, cut sides up, in an 11 x 7-inch baking dish. Place 1 teaspoon butter in center of each squash half. Combine brown sugar and remaining 8 ingredients in a small bowl; stir well. Sprinkle brown sugar mixture evenly into center of each squash half.
Cover and bake at 350° for 1 hour and 15 minutes or until squash is tender.