Healthy Spaghetti Squash Au Gratin – TartAmour

Ingredients

• 1 medium spaghetti squash
• 2 tablespoons olive oil
• 1 cup chopped onion
• 2 cloves garlic, minced
• 1 teaspoon dried thyme
• 1 teaspoon salt
• 1/2 teaspoon black pepper
• 1 cup low-fat Greek yogurt
• 3/4 cup grated Parmesan cheese, divided
• 1 cup shredded mozzarella cheese