Preheat the oven: Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper or lightly grease it with olive oil.

1. Prepare the squash: Peel the butternut squash using a vegetable peeler. Cut off the top and bottom ends, then slice the squash in half lengthwise. Scoop out the seeds with a spoon. Cut the squash into 1-inch cubes for even cooking.
2. Season the squash: Place the cubed squash on the prepared baking sheet. Drizzle with olive oil, then sprinkle with salt, pepper, cinnamon, and nutmeg (if using). Toss everything together until the squash is evenly coated in the oil and spices.
3. Roast the squash: Spread the squash cubes in a single layer on the baking sheet. Roast in the preheated oven for 25-30 minutes, or until the squash is golden brown and tender. Halfway through the cooking time, flip the squash cubes to ensure even roasting.
4. Finish and serve: Once the squash is roasted to perfection, remove it from the oven. If you’d like an added touch of sweetness, drizzle the squash with maple syrup or honey. Garnish with fresh rosemary or thyme for a pop of color and flavor, and serve warm.