Ingredients

• 1 spaghetti squash, halved and seeded
• salt and ground black pepper to taste
• 3 Roma tomatoes, diced
• 1 small onion, diced
• 1 cup crumbled feta cheese
• 2 cups spinach, or more to taste
• 1 1/2 cups spaghetti sauce
• 1 cup shaved Parmesan cheese

Instructions

1. Preheat oven to 350 degrees F (175 degrees C). Place squash face down in a baking pan; pour in water to 1/2 inch.
2. Bake in the preheated oven until interior can be easily pierced with a fork, about 1 hour. Cool until easily handled, about 15 minutes.
3. Scrape squash flesh into spaghetti strands with a spoon; place into a bowl. Season with salt and pepper.
4. Spread squash, tomatoes, onion, feta cheese, spinach, and spaghetti sauce in 3 even layers in a casserole dish. Top with Parmesan cheese.
5. Bake in the preheated oven until Parmesan cheese is melted and bubbly, 30 minutes to 1 hour.