Cut squash 1 inch above bulb; save stem section for another use. Cut bulb in half lengthwise. Remove and discard seeds and membranes. Place squash halves, cut sides up, on a broiler pan; place 2 teaspoons maple syrup and 1/2 teaspoon butter in each squash half.
Bake at 375° for 1 hour or until the squash is tender, brushing cut sides with syrup mixture every 20 minutes.