Using a sharp knife, cut the stem end from the spaghetti squash so you have a flat surface. Place the flat end down and cut the squash lengthwise in half.
Use a spoon to scoop the seeds from the squash.
Drizzle the cut sides with olive oil and rub to evenly coat the insides. Place cut-side down on a baking sheet lined with parchment or a silicone baking mat.
Roast for 30-45 minutes, or until the flesh is tender and easily pierced with a fork.
Once cooled to the touch, use a fork to pull the squash into strands and separate from the skin.
Serve with your favorite sauce.
Notes
Store leftovers in an airtight container in the refrigerator for up to 5 days.
Cooking time will vary based on the size and age of the squash.
To make cutting easier, you can pierce the whole squash with a sharp knife a few times and microwave for 1-2 minutes to soften the skin and flesh just a bit.