Preheat oven to 400°F (205°C)
Cut spaghetti squash in half lengthwise
Scoop out seeds and stringy pulp
Drizzle cut sides with olive oil
Sprinkle with salt and pepper (optional garlic powder, Italian seasoning, chili flakes)
Place cut sides down on a baking sheet or in a baking dish
Bake until tender, 35–50 minutes, depending on size
Let cool 5–10 minutes
Use a fork to scrape the flesh into spaghetti-like strands
Toss with desired sauce or seasonings and serve