01 - Preheat the oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large bowl, toss the butternut squash cubes with olive oil, maple syrup, salt, pepper, and cinnamon (if using) until evenly coated.
03 - Spread the squash in a single layer on the prepared baking sheet.
04 - Roast for 30-35 minutes, turning once halfway through, until the squash is golden and tender.
05 - Transfer to a serving dish and sprinkle with chopped parsley if desired. Serve warm.