Baked spaghetti squash au gratin topped with cheese and breadcrumbs.

Spaghetti Squash Au Gratin: A Delicious and Healthy Recipe

ByCasey Monroe

Why Make This Recipe

Spaghetti Squash Au Gratin is a comforting dish that combines the delicious flavors of cheese and creamy sauce with the health benefits of spaghetti squash. This recipe is great for anyone looking for a healthy alternative to traditional gratin recipes. It is low in calories and packed with nutrients, making it perfect for family dinners or as a side dish for special occasions. The combination of rich cheeses and the tender squash creates a delightful dish that everyone will enjoy.

How to Make Spaghetti Squash Au Gratin

Ingredients:

  • 1 large spaghetti squash (about 3-4 pounds)
  • 4 tablespoons unsalted butter, divided
  • 1 medium yellow onion, finely chopped
  • 2 cloves garlic, minced
  • 4 tablespoons all-purpose flour
  • 3 cups whole milk
  • 1/2 teaspoon salt, plus more to taste
  • 1/4 teaspoon black pepper, plus more to taste
  • 1/4 teaspoon nutmeg
  • 1 cup grated Gruyere cheese, divided
  • 1 cup grated sharp cheddar cheese, divided
  • 1/2 cup grated Parmesan cheese, divided
  • 1/4 cup panko breadcrumbs
  • 2 tablespoons chopped fresh parsley, for garnish (optional)

Directions:

  1. Preheat oven to 400°F (200°C).
  2. Prepare the squash: Cut the spaghetti squash in half lengthwise and scoop out the seeds and stringy bits.
  3. Season the squash: Drizzle the cut sides of the squash with 2 tablespoons of melted butter. Sprinkle generously with salt and pepper.
  4. Roast the squash: Place the squash halves cut-side down on a baking sheet lined with parchment paper. Roast for 45-60 minutes, or until the squash is easily pierced with a fork and the flesh is tender.
  5. Shred the spaghetti squash: Once cool enough to handle, use a fork to shred the flesh into spaghetti-like strands and set aside.
  6. Melt the butter: In a large saucepan over medium heat, melt the remaining 2 tablespoons of butter.
  7. Sauté the onion and garlic: Add the chopped onion to the melted butter and cook until softened and translucent, about 5-7 minutes. Add the minced garlic and cook for another minute, until fragrant.
  8. Make a roux: Sprinkle the flour over the onion and garlic mixture. Cook, stirring constantly, for 1-2 minutes to create a roux.
  9. Whisk in the milk: Gradually whisk in the milk, a little at a time, ensuring there are no lumps. Keep whisking until the sauce is smooth.
  10. Simmer the sauce: Bring the sauce to a simmer, stirring constantly. Reduce the heat to low and simmer for 5-7 minutes, or until thickened slightly.
  11. Season the sauce: Stir in the salt, pepper, and nutmeg. Taste and adjust the seasonings as needed.
  12. Add the cheese: Remove the saucepan from heat. Stir in 3/4 cup of Gruyere cheese, 3/4 cup of cheddar cheese, and 1/4 cup of Parmesan until melted and the sauce is creamy. Reserve the remaining cheese for topping.
  13. Combine squash and sauce: Add the shredded spaghetti squash to the cheese sauce and stir gently.
  14. Transfer to baking dish: Pour the mixture into a greased 9×13 inch baking dish.
  15. Prepare the topping: In a small bowl, combine the remaining 1/4 cup Gruyere cheese, 1/4 cup cheddar cheese, 1/4 cup Parmesan, and panko breadcrumbs.
  16. Sprinkle the topping: Evenly sprinkle the cheese and breadcrumb mixture over the squash.
  17. Bake the au gratin: Bake for 20-25 minutes, or until the topping is golden brown and bubbly.
  18. Let it rest: Remove from the oven and let it rest for 5-10 minutes before serving.
  19. Garnish and serve: Garnish with chopped parsley if desired. Serve hot and enjoy!

How to Serve Spaghetti Squash Au Gratin

This delicious dish is best served hot as a main course or as a side with grilled meats or a fresh salad. You can enjoy it for lunch, dinner, or even as leftovers the next day.

How to Store Spaghetti Squash Au Gratin

If you have leftovers, store them in an airtight container in the refrigerator. It will stay fresh for up to 3-4 days. To reheat, simply place it in the oven or microwave until warmed through.

Tips to Make Spaghetti Squash Au Gratin

  • Be sure to roast the spaghetti squash thoroughly so that it shreds easily.
  • Use fresh cheese for a richer flavor.
  • Adjust the seasonings to suit your taste, adding more salt or pepper if desired.
  • For a crispy topping, broil for a few minutes after baking.

Variation

You can modify this recipe by adding cooked vegetables such as spinach or broccoli for extra nutrients. Additionally, you can use different cheeses like mozzarella or pepper jack for a unique taste.

FAQs

1. Can I use frozen spaghetti squash?
Yes, you can use frozen spaghetti squash, but be sure to thaw and drain any excess water before using it in the recipe.

2. How do I know when the squash is done roasting?
The squash is done when it is tender and easily pierced with a fork.

3. Can I make this dish ahead of time?
Yes, you can prepare the dish up to the baking step, cover it, and refrigerate it for several hours or overnight. Just bake it when you’re ready to serve.