Summarize the following:
Lightly grease a baking sheet or line with aluminum foil. Cook for 50 minutes or until tender. Use a knife or fork to determine whether the squash is finished. Add the onion and the garlic and cook for 2-3 minutes, stirring occasionally. Stir in tomatoes and cook for an additional 3-5 minutes. The pulp should come out in long, stringy pieces. Place in a mixing bowl. Add olive oil, salt, and pepper to taste.
Preheat oven to 375 degrees F (190 degrees C). Place spaghetti squash skin-side up on the baking sheet. Heat vegetable oil in a skillet over medium heat. Use a fork to scrape out the insides of each piece of squash. Toss with the cooked vegetables, feta cheese, olives, and basil. Serve immediately and enjoy!