Begin by preparing the butternut squash—either peel and dice it yourself or use pre-cut cubes for convenience. Arrange the squash evenly across a baking sheet, ensuring the pieces are laid out in a single, uncrowded layer for even roasting.
Lightly mist the squash with cooking spray, coating the surfaces to help the seasonings adhere and encourage browning. Sprinkle ground cinnamon and your chosen zero-calorie sweetener over the squash, then drizzle generously with the maple-flavored syrup.
Transfer the tray to a preheated oven set at 425°F (220°C). Roast for approximately 30 minutes, checking around the 20-minute mark, especially if your oven tends to cook quickly. The squash is ready once the edges begin to turn golden and develop a lightly caramelized crispness. Serve warm for a comforting, naturally sweetened side dish.