Preheat oven to 375℉. Line a baking sheet with foil or parchment.
Cut squash in half length-wise and use a spoon to remove and discard seeds and stringy, loose pulp from the center of each half. Drizzle each half with olive oil and sprinkle with salt and pepper. Place cut-side down on baking sheet and roast for 35-40 minutes or until soft to the touch. You can also test the squash with a fork. You should be able to pierce the skin and feel that the squash is tender inside.
Let cool slightly (to speed cooling, you can use a fork or spatula to flip the squash over once removed from the oven) and then use a fork to separate strands and remove squash from the skin.