Preheat the oven to 400°F.
Line a large, rimmed baking sheet with parchment paper.
Use a sharp knife to cut off the top and bottom ends of the spaghetti squash.
Stand the squash upright on a stable surface and slice through it from top to bottom to divide it in half.
Use a spoon to scoop out the seeds and discard them.
Drizzle the insides of each squash half with 1 teaspoon olive oil and rub it all over the inside. Sprinkle the interior of the squash with salt and pepper and then place the halves cut-side down on the prepared baking sheet.
Bake for 40 to 60 minutes, until the cut sides are turning golden and the interiors are easily pierced through with a fork. Small squash will be done sooner than large squash and will require less oil.
Once the squash is done baking, fluff the interiors with a fork—it will look like spaghetti. Serve as desired.