Healthy Spaghetti Squash Au Gratin
If you’re looking for a dish that feels like a warm hug but also keeps things light, then this Healthy Spaghetti Squash Au Gratin is just the ticket! I can’t tell you how many times this recipe has saved me on busy weeknights or family gatherings. It’s rich and cheesy without the guilt, bursting with flavor while being low in carbs. Trust me, once you try it, you’ll find yourself reaching for this recipe again and again!
What makes this recipe even more special is its versatility. You can serve it as a hearty side dish or enjoy it as a light main course. Whether it’s a cozy dinner at home or a festive holiday spread, this dish will surely impress your family and friends.
Why You’ll Love This Recipe
- Easy to prepare: With just a few simple steps, you can whip up this delicious dish without breaking a sweat!
- Family-friendly: Kids and adults alike will love the cheesy goodness packed into each bite.
- Make-ahead option: Prepare it in advance and pop it in the oven when you’re ready to eat—perfect for busy days!
- Veggie-packed: Enjoy all the benefits of vegetables without sacrificing taste or texture.
- Comfort food with a twist: This isn’t your average gratin; it’s healthy, satisfying, and oh-so-delicious!

Ingredients You’ll Need
The best part about making this Healthy Spaghetti Squash Au Gratin is that the ingredients are simple and wholesome. You’ll find everything you need right in your kitchen or local grocery store. Here’s what you’ll need:
For the Main Dish
- 1 medium spaghetti squash
- 1 tbsp olive oil
- ½ cup diced onion
- 2 cloves garlic (minced)
- ½ cup plain Greek yogurt (or sour cream)
- 1½ cups shredded sharp cheddar cheese (divided)
- ¼ tsp salt
- ¼ tsp black pepper
Optional Flavor Boosts
- ¼ tsp paprika or dried thyme
Variations
One of the things I love about this recipe is how flexible it is! You can easily make it your own with these fun variations:
- Add some greens: Toss in some fresh spinach or kale for an extra nutrient boost.
- Mix in other veggies: Try adding sautéed mushrooms or zucchini for added texture and flavor.
- Change up the cheese: Swap out sharp cheddar for mozzarella or pepper jack if you want some heat!
- Make it spicy: Add red pepper flakes to give your gratin a little kick.
How to Make Healthy Spaghetti Squash Au Gratin
Step 1: Roast the Spaghetti Squash
Preheat your oven to 400°F (205°C). Slice the spaghetti squash in half lengthwise and scoop out the seeds. This step is important because roasting helps bring out that natural sweetness in the squash. Brush the cut sides with olive oil before placing them face-down on a baking sheet. Roast for 35–40 minutes until tender, which will make shredding so much easier!
Step 2: Sauté Onions and Garlic
While the squash roasts, heat a skillet over medium heat. Sauté the diced onions in a bit of olive oil until softened—this usually takes about 5 minutes. Adding minced garlic for just one more minute elevates the flavor profile beautifully! Remove from heat as soon as they become fragrant.
Step 3: Shred Your Squash
Once your roasted spaghetti squash has cooled down enough to handle, use a fork to shred it into noodle-like strands. This step is what gives our gratin its delightful texture!
Step 4: Combine Ingredients
In a large bowl, mix together those lovely shredded squash strands with sautéed onions and garlic, Greek yogurt, 1 cup of cheese, salt, pepper, and any optional spices like paprika or thyme. Mixing everything together ensures every bite is packed with flavor!
Step 5: Transfer to Casserole Dish
Transfer your mixture into a greased casserole dish. Don’t forget to top it off with the remaining ½ cup of cheese! This layer will create that irresistible bubbly crust we all crave.
Step 6: Bake Until Golden
Bake at 375°F for about 20–25 minutes until hot and bubbly with that golden top we love so much! Let cool slightly before serving—it’s hard to resist diving right in!
Enjoy your Healthy Spaghetti Squash Au Gratin as either a delightful side dish or a light main course!
Pro Tips for Making Healthy Spaghetti Squash Au Gratin
Creating the perfect Healthy Spaghetti Squash Au Gratin is all about technique and a few handy tips to ensure your dish turns out just right!
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Choose the right squash: Look for a spaghetti squash that’s firm and heavy for its size. This ensures you get the best texture and flavor in your dish.
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Don’t rush the roasting: Allowing the squash to roast until it’s tender makes it easier to shred. If undercooked, it can be hard to achieve those lovely noodle-like strands.
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Mix it up: Feel free to add in other vegetables like spinach or bell peppers. This not only boosts nutrition but also adds vibrant colors and flavors to the dish.
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Experiment with cheese: While sharp cheddar is a classic choice, don’t hesitate to mix in some mozzarella or gouda for added creaminess. Each cheese brings its own unique flavor profile!
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Let it rest: Allowing your gratin to cool slightly before serving helps it set up nicely, making it easier to serve without falling apart.
How to Serve Healthy Spaghetti Squash Au Gratin
This scrumptious dish deserves a moment in the spotlight! Here are some delightful ideas on how to present and enjoy your Healthy Spaghetti Squash Au Gratin.
Garnishes
- Chopped fresh herbs: Sprinkling fresh parsley or chives on top adds a burst of color and freshness that complements the rich flavors beautifully.
- Crushed red pepper flakes: For those who enjoy a bit of heat, a sprinkle of crushed red pepper flakes can elevate the dish and add an exciting kick.
- Lemon zest: A light grating of lemon zest over the top before serving brings brightness and balances the richness of the cheese.
Side Dishes
- Roasted Brussels sprouts: Tossed with olive oil, salt, and pepper, these caramelized bites are crispy on the outside and tender inside—a perfect contrast!
- Garlic sautéed kale: Quickly sautéed with garlic, this side is packed with nutrients and offers a lovely savory element that pairs well with the gratin.
- Quinoa salad: A refreshing quinoa salad with cherry tomatoes, cucumber, and a lemon vinaigrette adds a lightness that balances the richness of the au gratin.
- Steamed green beans: Simple yet elegant, steamed green beans tossed with a little olive oil and sea salt provide crunch and freshness alongside your dish.
Enjoy making your Healthy Spaghetti Squash Au Gratin shine on any table—it’s sure to impress family and friends alike!

Make Ahead and Storage
This Healthy Spaghetti Squash Au Gratin is perfect for meal prep! You can make it ahead of time and store it for later use, making your weeknight dinners a breeze.
Storing Leftovers
- Allow the dish to cool completely before storing.
- Transfer leftovers to an airtight container.
- Store in the refrigerator for up to 3-4 days.
Freezing
- Let the dish cool entirely before freezing.
- Place in a freezer-safe container or wrap tightly in plastic wrap and aluminum foil.
- Freeze for up to 2-3 months.
Reheating
- For best results, thaw the dish in the refrigerator overnight before reheating.
- Reheat in the oven at 350°F (175°C) for about 20 minutes until heated through.
- Alternatively, you can microwave individual portions for about 2-3 minutes, stirring halfway through.
FAQs
If you have any questions about this recipe, you’re not alone! Here are some common inquiries to help you out.
Can I make Healthy Spaghetti Squash Au Gratin ahead of time?
Absolutely! You can prepare it up to a day in advance and simply bake it when you’re ready to serve. This makes it a great option for busy weeknights.
What can I substitute for Greek yogurt in Healthy Spaghetti Squash Au Gratin?
You can use sour cream or a plant-based yogurt alternative if you prefer. Both will provide a similar creamy texture without sacrificing flavor.
How do I know when my spaghetti squash is done roasting?
The squash should be tender enough that you can easily shred the flesh into noodle-like strands with a fork. This typically takes about 35-40 minutes at 400°F (205°C).
Is Healthy Spaghetti Squash Au Gratin suitable for gluten-free diets?
Yes! This recipe is naturally gluten-free, making it an excellent choice for anyone avoiding gluten while still enjoying a delicious meal.
Final Thoughts
I hope you feel inspired to try this Healthy Spaghetti Squash Au Gratin! It’s such a comforting, flavorful dish that brings warmth to any table—perfect for both casual dinners and special occasions. Enjoy making this recipe, and don’t hesitate to share your experience or any variations you try. Happy cooking!
Healthy Spaghetti Squash Au Gratin
- Prep Time: 15 minutes
- Cook Time: 40 minutes
- Total Time: 55 minutes
- Yield: Serves 6
- Category: Main
- Method: Baking
- Cuisine: American
Description
Indulge in the warmth of our Healthy Spaghetti Squash Au Gratin, where comfort food meets nutritious ingredients! This delightful dish features tender spaghetti squash enveloped in a creamy, cheesy mixture that will satisfy your cravings without the guilt. Perfect for busy weeknights or festive gatherings, this recipe is versatile enough to be served as a hearty side or a light main course. Packed with flavor and easy to prepare, it’s bound to become a staple in your kitchen. Plus, with options to customize and make ahead, you can enjoy this veggie-packed gratin any time!
Ingredients
- 1 medium spaghetti squash
- 1 tbsp olive oil
- ½ cup diced onion
- 2 cloves garlic (minced)
- ½ cup plain Greek yogurt
- 1½ cups shredded sharp cheddar cheese (divided)
- ¼ tsp salt
- ¼ tsp black pepper
Instructions
- Preheat oven to 400°F (205°C). Cut spaghetti squash in half lengthwise and scoop out seeds. Brush cut sides with olive oil and place face-down on a baking sheet. Roast for 35–40 minutes until tender.
- In a skillet, heat olive oil over medium heat, sauté onions until softened (about 5 minutes), then add garlic for an additional minute.
- Once the squash has cooled slightly, shred it into noodle-like strands with a fork.
- In a bowl, combine shredded squash, sautéed onions and garlic, Greek yogurt, 1 cup cheese, salt, pepper, and optional spices.
- Transfer to a greased casserole dish and top with remaining cheese. Bake at 375°F (190°C) for 20–25 minutes until bubbly and golden.
Nutrition
- Serving Size: 1 serving
- Calories: 210
- Sugar: 3g
- Sodium: 290mg
- Fat: 11g
- Saturated Fat: 6g
- Unsaturated Fat: 4g
- Trans Fat: 0g
- Carbohydrates: 16g
- Fiber: 3g
- Protein: 10g
- Cholesterol: 30mg
