Preheat oven to 350° F. Brush spaghetti squash (cut side) with oil and place cut side down on a baking sheet lined with parchment. Bake for 30-40 (time will depend on size) minutes or until the flesh becomes a bit translucent and the skin begins to soften. You can test it by sticking a fork into the flesh side and seeing if it starts to fall apart. Be sure not to overcook as it will get too sweet.