01 - Preheat oven to 400°F and line a baking sheet with parchment paper.
02 - Halve the squash lengthwise and scoop out seeds.
03 - Brush cut sides with olive oil and season evenly with kosher salt and black pepper.
04 - Place squash halves cut-side down on the prepared baking sheet.
05 - Roast squash for 35 to 40 minutes until the flesh is very tender when pierced with a fork.
06 - In a small bowl, combine softened butter, brown sugar, cinnamon, and nutmeg, mixing until smooth.
07 - Remove squash from oven and carefully turn halves cut-side up.
08 - Spoon the brown sugar butter mixture evenly over each squash half.
09 - Return to oven and roast for 5 to 7 minutes more until the butter is melted and bubbly.
10 - Serve hot, spooning any extra glaze over the squash.