Preheat oven to 400°F (200°C).
Place the squash halves on a baking sheet, cut side up, and distribute the butter and maple syrup into the cavities.
Roast in the oven until the squash is tender, about 40-50 minutes, occasionally basting the squash with the pooled butter and syrup.
Sprinkle toasted pecans over the roasted squash before serving.
