Spaghetti Squash Casserole

1 spaghetti squash, halved lengthwise and seeded
2 tablespoons vegetable oil
1 onion, chopped
1 clove garlic, minced
1 1/2 cups chopped tomatoes
3/4 cup crumbled feta cheese
3 tablespoons sliced black olives 

Preheat oven to 350F

Place spaghetti squash with cut sides down on a greased baking sheet, and bake 30 minutes in the preheated oven, or until a sharp knife can be inserted with only a little resistance. Remove squash from oven and set aside to cool. Heat oil in a skillet over medium heat. Cook and stir onion until tender. Add garlic; cook and stir until fragrant,. Stir in tomatoes and cook until warmed through. Use a large spoon to scoop the stringy pulp from the squash and place in a medium bowl. Toss with the vegetables, feta cheese, olives, and basil. Serve warm.