Healthy Spaghetti Squash Au Gratin
If you’re looking for a dish that feels like a warm hug on a chilly evening, then this Healthy Spaghetti Squash Au Gratin is just what you need. It’s the perfect blend of comfort and wholesome goodness, making it a favorite in my kitchen. I love how this dish brings together the cozy flavors of cheese and roasted squash, all while keeping things light and nutritious.
This recipe shines during busy weeknights when you want something easy yet satisfying. But it’s also great for family gatherings or festive occasions when you want to impress without the stress. Trust me, your loved ones will be asking for seconds!
Why You’ll Love This Recipe
- Quick and Easy: With just a bit of prep, this dish comes together in no time!
- Family-Friendly: Kids and adults alike will enjoy the cheesy goodness—making veggies fun!
- Make-Ahead Convenience: You can prepare it ahead of time and pop it in the oven when you’re ready.
- Versatile Dish: Perfect as a side or a light main course, it fits any meal occasion.
- Packed with Flavor: The combination of garlic, onion, and cheddar creates an irresistible taste!

Ingredients You’ll Need
Let’s gather some simple, wholesome ingredients to whip up this delightful dish! You’ll find everything you need right here—no fancy items required.
- 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: ¼ tsp paprika or dried thyme
Variations
One of the best things about this Healthy Spaghetti Squash Au Gratin is how flexible it is! Feel free to get creative with these simple swaps:
- Add More Veggies: Toss in some spinach or kale for an extra nutrient boost.
- Change Up the Cheese: Use mozzarella or pepper jack for a different flavor profile.
- Make It Spicy: Add red pepper flakes or jalapeños if you like a little heat.
- Herb It Up: Fresh herbs like basil or parsley can elevate the flavor even more.
How to Make Healthy Spaghetti Squash Au Gratin
Step 1: Preheat Your Oven
Start by preheating your oven to 400°F (205°C). This ensures your spaghetti squash roasts evenly and develops that sweet flavor we all love.
Step 2: Roast the Spaghetti Squash
Slice the spaghetti squash in half lengthwise and scoop out those pesky seeds. Brush the cut sides with olive oil before placing them face-down on a baking sheet. Roasting for 35–40 minutes softens the squash so you can easily shred it into noodle-like strands later.
Step 3: Sauté Your Aromatics
While your squash is roasting, heat a skillet over medium heat. Sautéing the onions until softened (about 5 minutes) brings out their natural sweetness, followed by adding minced garlic for that aromatic punch! Cook it just for another minute before removing from heat.
Step 4: Shred Your Squash
Once your roasted spaghetti squash is cool enough to handle, it’s time for some fun! Use a fork to shred it into those lovely noodle-like strands. This step transforms it into the star of our dish!
Step 5: Mix It All Together
In a large bowl, combine your shredded squash with those sautéed onions and garlic, Greek yogurt (or sour cream), one cup of shredded cheese, salt, pepper, and if you’re feeling adventurous, add paprika or thyme. This mixture will create creamy goodness that binds everything together.
Step 6: Assemble in Casserole Dish
Transfer your delicious mixture into a greased casserole dish. Top it off with the remaining half cup of cheese. This cheesy topping will melt beautifully while baking!
Step 7: Bake Until Bubbly
Pop your casserole into the oven set at 375°F (190°C) for about 20–25 minutes. You’ll know it’s done when it’s hot, bubbly, and has that gorgeous golden top.
Step 8: Serve and Enjoy!
Let your Healthy Spaghetti Squash Au Gratin cool slightly before serving. It makes an excellent side dish or can stand alone as a light main course. Enjoy every comforting bite!
Pro Tips for Making Healthy Spaghetti Squash Au Gratin
Creating the perfect Healthy Spaghetti Squash Au Gratin is a breeze with a few handy tips!
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Choose a ripe squash: Look for a spaghetti squash that feels heavy and has a firm skin. This ensures you get the best flavor and texture.
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Don’t skip the roasting: Roasting the spaghetti squash not only enhances its natural sweetness but also makes it easier to shred into those delightful noodle-like strands.
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Experiment with spices: Adding optional spices like paprika or dried thyme can elevate the dish’s flavor profile. A little extra seasoning goes a long way in making this dish memorable!
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Use high-quality cheese: Opt for sharp cheddar cheese for a more robust flavor. It adds richness and makes your gratin irresistibly cheesy without needing too much.
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Let it cool before serving: Allowing the dish to rest for a few minutes after baking helps it set, making it easier to scoop out portions while still keeping that gooey, melted cheese intact.
How to Serve Healthy Spaghetti Squash Au Gratin
When it comes to serving your Healthy Spaghetti Squash Au Gratin, presentation is key! This dish can be dressed up or down depending on the occasion, making it versatile enough for both casual dinners and festive gatherings.
Garnishes
- Chopped fresh herbs: Sprinkling fresh parsley or chives on top brightens up the dish and adds a pop of color.
- Toasted breadcrumbs: For an added crunch, sprinkle some toasted whole-grain breadcrumbs over the top before baking. They provide a delightful textural contrast!
Side Dishes
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Mixed Green Salad: A light salad with mixed greens, cherry tomatoes, and a vinaigrette dressing complements the richness of the gratin perfectly.
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Roasted Vegetables: Seasonal roasted vegetables, such as Brussels sprouts or carrots, add color and nutrition to your plate while balancing flavors beautifully.
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Garlic Bread: A slice of warm garlic bread is always a hit! It’s perfect for scooping up any leftover cheesy goodness from your gratin.
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Quinoa Pilaf: Serve alongside quinoa pilaf infused with herbs and lemon zest. It offers protein and complements the textures in the gratin while being light on the palate.
Now that you have all these tips and serving suggestions at your fingertips, you’re all set to make your Healthy Spaghetti Squash Au Gratin shine on any table! Enjoy every cheesy bite!

Make Ahead and Storage
This Healthy Spaghetti Squash Au Gratin is perfect for meal prep! You can easily whip up a batch ahead of time, making your weeknight dinners or special occasions a breeze.
Storing Leftovers
- Store any leftover spaghetti squash au gratin in an airtight container.
- Refrigerate for up to 3–5 days.
- Label the container with the date to keep track of freshness.
Freezing
- Allow the dish to cool completely before freezing.
- Transfer portions into freezer-safe containers or bags.
- Freeze for up to 2–3 months for optimal flavor and texture.
Reheating
- Thaw in the refrigerator overnight if frozen.
- Reheat in the oven at 350°F (175°C) until heated through, about 15–20 minutes.
- Alternatively, warm individual servings in the microwave on medium power until hot, stirring occasionally.
FAQs
Here are some common questions about this delightful recipe!
Can I make Healthy Spaghetti Squash Au Gratin ahead of time?
Absolutely! This dish can be prepared a day in advance and stored in the fridge. Just reheat it when you’re ready to serve.
What can I substitute for Greek yogurt in Healthy Spaghetti Squash Au Gratin?
You can use sour cream or a non-dairy yogurt alternative if you prefer. Both will provide that creamy texture without compromising flavor.
Is Healthy Spaghetti Squash Au Gratin suitable for a vegetarian diet?
Yes! This recipe is packed with vegetables and cheese, making it a delicious vegetarian option.
How do I know when my spaghetti squash is done roasting?
Your spaghetti squash is done when it’s fork-tender—simply poke it with a fork; if it goes in easily, it’s ready!
Final Thoughts
I hope you find this Healthy Spaghetti Squash Au Gratin as comforting and satisfying as I do! It’s not only a wonderful side dish but also makes for a light main course that everyone will love. Enjoy experimenting in your kitchen and don’t hesitate to share your own variations! Happy cooking!
Healthy Spaghetti Squash Au Gratin
Indulge in the comfort of this Healthy Spaghetti Squash Au Gratin, a delightful dish that brings together the warmth of roasted squash and creamy cheese without the guilt. Perfect for chilly evenings or busy weeknights, this veggie-packed casserole is not only nutritious but also incredibly satisfying. With layers of flavor from garlic, onion, and sharp cheddar cheese, it’s a dish that family and friends will rave about. Whether served as a side or a light main course, this gratin will surely impress. Get ready to enjoy a warm hug in a bowl!
- Prep Time: 15 minutes
- Cook Time: 50 minutes
- Total Time: 1 hour 5 minutes
- Yield: Serves 6
- Category: Main
- Method: Baking
- Cuisine: American
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
- Optional: ¼ tsp paprika or dried thyme
Instructions
- Preheat your oven to 400°F (205°C).
- Slice the spaghetti squash in half lengthwise and scoop out the seeds. Brush cut sides with olive oil and place face-down on a baking sheet. Roast for 35–40 minutes until tender.
- While the squash roasts, heat a skillet over medium heat and sauté onions until softened (about 5 minutes). Add minced garlic and cook for an additional minute.
- Once the squash is cool enough to handle, shred it into noodle-like strands using a fork.
- In a large bowl, mix shredded squash with sautéed onions, garlic, Greek yogurt, 1 cup cheese, salt, pepper, and optional spices.
- Transfer mixture to a greased casserole dish and top with remaining cheese.
- Bake at 375°F (190°C) for 20–25 minutes until bubbly and golden.
- Let cool slightly before serving.
Nutrition
- Serving Size: 1 serving
- Calories: 230
- Sugar: 3g
- Sodium: 360mg
- Fat: 12g
- Saturated Fat: 7g
- Unsaturated Fat: 4g
- Trans Fat: 0g
- Carbohydrates: 20g
- Fiber: 4g
- Protein: 11g
- Cholesterol: 30mg
