Spaghetti Squash Gratins with Chunky Tomato Sauce

1 teaspoon olive oil

2 garlic cloves, minced

1 teaspoon kosher salt , divided

1/2 teaspoon freshly ground black pepper , divided

1/4 teaspoon crushed red pepper

2 (28-ounces) cans whole tomato es, drained and chopped

3 oregano sprigs

3 thyme sprigs

1/2 cup (2 ounces) grated fresh Parmesan cheese

2 teaspoons chopped fresh oregano

1 teaspoon chopped fresh thyme

1 (15-ounce) carton fat-free ricotta cheese