Preheat oven to 425°.
Cut each squash in half lengthwise. Discard seeds and membranes. Cut each half crosswise into 1-inch-thick slices; peel. Combine syrup, oil, salt, and pepper in a large bowl, stirring well. Add squash; toss to coat.
Place squash in a 13 x 9-inch baking dish coated with cooking spray. Bake at 425° for 25 minutes or until tender, stirring every 10 minutes.