Healthy Spaghetti Squash Au Gratin
If you’re looking for a dish that feels like a warm hug, let me introduce you to my Healthy Spaghetti Squash Au Gratin. This recipe is a delightful combination of rich flavors and wholesome ingredients, making it the perfect comfort food without the guilt. Whether it’s a busy weeknight or a special family gathering, this dish shines bright as both a comforting main and a satisfying side. Plus, it’s an easy way to sneak in some extra veggies!
What makes this recipe special is how it transforms spaghetti squash into something truly indulgent. With creamy Greek yogurt and sharp cheddar cheese, every bite is packed with flavor while keeping things light and fresh. Trust me, once you try it, you’ll want to keep this one in your recipe rotation!
Why You’ll Love This Recipe
- Easy to Make: With just a handful of simple steps, you can whip up this dish without any fuss.
- Family-Friendly: Everyone loves cheesy goodness, and this recipe will have even the pickiest eaters coming back for more!
- Make-Ahead Friendly: Prep it in advance and bake when you’re ready for a quick dinner solution.
- Packed with Flavor: The combination of sautéed onions, garlic, and cheese creates a mouthwatering experience that will impress your guests.

Ingredients You’ll Need
Gathering your ingredients for this Healthy Spaghetti Squash Au Gratin is straightforward. These are simple, wholesome ingredients that pack a punch of flavor and nutrition. Here’s what you’ll need:
- 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
This Healthy Spaghetti Squash Au Gratin is wonderfully flexible! Feel free to customize it based on your taste preferences or what you have on hand.
- Add More Veggies: Toss in some spinach or kale before baking for an extra nutritional boost.
- Change Up the Cheese: Try different types of cheese like mozzarella or pepper jack for varied flavors.
- Spice It Up: Add some red pepper flakes if you enjoy a little heat in your dishes.
- Herb Infusion: Fresh herbs like parsley or basil can brighten the flavors beautifully.
How to Make Healthy Spaghetti Squash Au Gratin
Step 1: Roast the Squash
Preheat your oven to 400°F (205°C). Slice the spaghetti squash in half lengthwise and scoop out the seeds. Roasting the squash brings out its natural sweetness and softens it so that you can easily shred it into noodle-like strands later.
Step 2: Sauté the Onions and Garlic
While the squash is roasting, heat a skillet over medium heat. Sauté the diced onions in a bit of olive oil until they are softened—this usually takes about 5 minutes. Adding minced garlic for the last minute enhances the aroma and flavor. This step is crucial as it builds that wonderful base flavor for our gratin.
Step 3: Shred the Squash
Once your roasted squash has cooled enough to handle, take a fork and gently scrape out the flesh into strands. This creates those amazing noodles we love about spaghetti squash!
Step 4: Combine Ingredients
In a large bowl, mix together your shredded squash with those beautifully sautéed onions and garlic, Greek yogurt, 1 cup of shredded cheese, salt, pepper, and any optional spices like paprika or thyme you wish to include. This mixture embodies all that cheesy goodness we crave!
Step 5: Bake It All Together
Transfer your cheesy vegetable mixture into a greased casserole dish. Top everything off with the remaining ½ cup of shredded cheese. Bake at 375°F for about 20–25 minutes until hot and bubbly with that irresistible golden top.
Step 6: Serve and Enjoy!
Let your Healthy Spaghetti Squash Au Gratin cool slightly before serving. It’s delicious as either a light main dish or as an impressive side at any meal! Enjoy every cheesy bite!
Pro Tips for Making Healthy Spaghetti Squash Au Gratin
This dish is a delightful way to enjoy healthy comfort food, and a few pro tips will take your Spaghetti Squash Au Gratin to the next level!
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Choose the right squash: Look for a spaghetti squash that feels heavy for its size and has a smooth, yellow skin. This ensures optimal flavor and texture.
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Perfectly roast your squash: Roasting it cut-side down helps create steam within the squash, making it easier to shred and enhancing its natural sweetness.
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Sauté with care: When sautéing onions and garlic, keep an eye on them to prevent burning. Softening the onions first allows their natural sugars to caramelize, resulting in a richer flavor.
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Experiment with cheeses: While sharp cheddar is delicious, feel free to mix in other varieties like mozzarella or pepper jack for added creaminess or spice.
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Make it ahead: This dish can be prepared a day in advance. Just assemble everything, cover it, and refrigerate until you’re ready to bake! This makes it perfect for busy weeknights or holiday gatherings.
How to Serve Healthy Spaghetti Squash Au Gratin
Presenting this comforting dish beautifully can elevate your meal experience. Here are some ideas to make it truly shine at your table!
Garnishes
- Fresh herbs: Chopped parsley or chives add a pop of color and freshness that brightens up the rich flavors of the gratin.
- Crushed red pepper flakes: A sprinkle of these adds just the right amount of heat for those who enjoy a little kick in their dishes.
Side Dishes
- Simple Green Salad: A fresh salad with mixed greens, cherry tomatoes, and a light vinaigrette provides a refreshing contrast to the creamy gratin.
- Roasted Brussels Sprouts: The slight bitterness and crispy edges of roasted Brussels sprouts complement the rich cheese flavor perfectly.
- Garlic Breadsticks: Soft, warm breadsticks brushed with garlic butter are fantastic for scooping up any leftovers from the dish.
- Steamed Broccoli: Lightly steamed broccoli adds some vibrant green color to your plate while keeping the meal nutritious and balanced.
With these tips and serving suggestions, your Healthy Spaghetti Squash Au Gratin will not only taste incredible but also impress anyone you share it with! Enjoy every delicious bite!

Make Ahead and Storage
This Healthy Spaghetti Squash Au Gratin is perfect for meal prep, making it easy to enjoy throughout the week. You can prepare it ahead of time, store leftovers, or even freeze portions for a quick meal later.
Storing Leftovers
- Let the dish cool completely before storing.
- Transfer any leftovers to an airtight container.
- Store in the refrigerator for up to 3–4 days.
Freezing
- Allow the dish to cool completely.
- Portion it into freezer-safe containers or bags.
- Seal tightly and label with the date. It can be frozen for up to 2 months.
Reheating
- Thaw overnight in the refrigerator if frozen.
- Reheat in the oven at 350°F (175°C) until warmed through, about 15–20 minutes.
- Alternatively, you can reheat individual portions in the microwave for about 1–2 minutes.
FAQs
Here are some common questions about our Healthy Spaghetti Squash Au Gratin that might help you out!
Can I use other types of cheese in Healthy Spaghetti Squash Au Gratin?
Absolutely! While sharp cheddar adds a wonderful flavor, feel free to experiment with other cheeses like mozzarella or Monterey Jack for a different taste profile.
How can I make Healthy Spaghetti Squash Au Gratin vegan?
To make this recipe vegan, substitute Greek yogurt with a plant-based yogurt or cashew cream, and use vegan cheese alternatives. It’ll still be delicious!
What is the best way to cut spaghetti squash?
The safest way to cut spaghetti squash is by using a sharp knife and a stable cutting board. Slice off both ends first for stability, then cut it in half lengthwise.
Final Thoughts
I hope this Healthy Spaghetti Squash Au Gratin becomes a cherished recipe in your kitchen! It’s not only comforting and delicious but also a fantastic way to enjoy veggies without sacrificing flavor. Whether you’re serving it as a side or a light main dish, I’m sure you’ll love every bite. Happy cooking!
Healthy Spaghetti Squash Au Gratin
Indulge in the comforting flavors of Healthy Spaghetti Squash Au Gratin, a wholesome dish that perfectly balances rich taste and nutrition. This delightful recipe transforms spaghetti squash into a creamy, cheesy casserole that feels indulgent but is packed with healthy ingredients. With layers of sautéed onions, garlic, and a blend of Greek yogurt and sharp cheddar cheese, each bite is a warm embrace on your plate. Ideal for busy weeknights or festive gatherings, this dish is not only easy to prepare but also a fantastic way to sneak extra veggies into your meal. Serve it as a satisfying main course or an impressive side; either way, it promises to be a hit at the dinner table!
- Prep Time: 15 minutes
- Cook Time: 40 minutes
- Total Time: 55 minutes
- Yield: Serves approximately 6 people 1x
- 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
Instructions
- Preheat the oven to 400°F (205°C). Cut the spaghetti squash in half lengthwise and scoop out the seeds. Place it cut-side down on a baking sheet and roast for about 30–40 minutes until tender.
- In a skillet over medium heat, sauté diced onions in olive oil for about 5 minutes until softened, adding minced garlic for the last minute.
- Once roasted and cooled, shred the squash into noodle-like strands using a fork.
- In a large bowl, combine shredded squash with sautéed onions and garlic, Greek yogurt, 1 cup of cheese, salt, and pepper.
- Transfer the mixture to a greased casserole dish, top with remaining cheese, and bake at 375°F (190°C) for 20–25 minutes or until bubbly and golden.
Nutrition
- Serving Size: Approximately ¾ cup (150g)
- Calories: 185
- Sugar: 3g
- Sodium: 320mg
- Fat: 10g
- Saturated Fat: 5g
- Unsaturated Fat: 4g
- Trans Fat: 0g
- Carbohydrates: 15g
- Fiber: 3g
- Protein: 10g
- Cholesterol: 25mg
