01 - Preheat your oven to 400°F. Line a baking sheet with parchment paper to prevent sticking.
02 - Carefully halve the squash lengthwise. Using a spoon, scoop out and discard the seeds and fibrous strands from both halves.
03 - Brush the cut sides of the squash with olive oil. Season generously with kosher salt and freshly ground black pepper.
04 - Place the squash halves, cut side down, onto the prepared baking sheet.
05 - Roast the squash in the preheated oven for 35–40 minutes, or until the flesh is very tender when pierced with a fork.
06 - While the squash roasts, combine the softened unsalted butter, packed brown sugar, ground cinnamon, and optional pinch of ground nutmeg in a small bowl. Mix until the glaze is smooth and well combined.
07 - Once roasted, carefully remove the baking sheet from the oven. Flip each squash half so the cut side is now facing up.
08 - Evenly spoon the prepared brown sugar butter glaze over the exposed surface of each squash half.
09 - Return the squash to the oven for an additional 5–7 minutes, allowing the butter glaze to melt, bubble, and slightly caramelize.
10 - Serve the roasted squash hot, spooning any extra glaze from the baking sheet over each serving for added richness.