Preheat your oven to 400°F (200°C).
Carefully cut the butternut squash in half lengthwise.
Scoop out the seeds using a spoon.
Drizzle olive oil over the cut sides of the squash.
Sprinkle salt, black pepper, and cinnamon if desired.
Place the squash halves cut-side down on a baking sheet.
Roast in the preheated oven for 30-40 minutes until tender.
Check doneness by piercing with a fork; it should be soft.
Once cooked, remove from the oven and let cool slightly.
Serve warm, garnished with fresh herbs if desired.