As I lifted the lid of the oven, a rich, cheesy aroma enveloped the kitchen, instantly comforting me. This moment marked the birth of my beloved Spaghetti Squash Au Gratin, a dish that captures everything I adore about comforting meals, minus the guilt! It’s perfect for those of us seeking a low-carb and delicious alternative to traditional au gratin, and thanks to the unique texture of spaghetti squash, it feels like you’re indulging while actually making a nourishing choice. Packed with the goodness of protein and vegetables, this creamy delight is destined to be a family favorite that comes together effortlessly. Curious how to bring this delightful dish to your table? Let’s dive in!

Why Choose Spaghetti Squash Au Gratin?
Deliciously Guilt-Free: This creamy Spaghetti Squash Au Gratin allows you to indulge without breaking your diet. Rich, Comforting Flavor: The blend of cheese and spices creates a savory delight that satisfies cravings. Quick and Easy: With minimal prep and cook time, it’s perfect for busy weeknights! Versatile Meal: Swap chicken for ground beef or add your favorite veggies like spinach for a twist. Plus, it pairs beautifully with a fresh salad or grilled meats for a complete meal. Transform your dinner routine with this delightful recipe that your whole family will love!
Spaghetti Squash Au Gratin Ingredients
Here’s everything you need to create this creamy, comforting dish!
For the Base
- Spaghetti Squash – This provides a noodle-like texture, helping to keep the dish low carb and satisfying.
- Chicken Breast – Adds essential protein; consider using rotisserie chicken for a quick alternative.
For the Flavor Base
- Onion – Perfect for adding depth of flavor; swap with shallots for a milder taste.
- Butter – Aids in sautéing the onions and adds richness; olive oil works as a lighter substitute.
- Garlic – Enhances the dish’s flavor; if in a pinch, garlic powder can stand in for fresh.
For the Creaminess
- Plain Greek Yogurt – This binds the ingredients and offers creaminess; it can be switched with sour cream for a richer taste.
- Cheddar Cheese – Provides that delicious au gratin richness; select a reduced-fat option for a lighter meal and mix with mozzarella for extra flavor.
For Seasoning
- Salt – Essential for enhancing overall flavors; adjust to your taste preference.
- Black Pepper – Offers necessary seasoning; sprinkle as desired.
This Spaghetti Squash Au Gratin is ready to become a warm and welcoming staple in your home!
Step‑by‑Step Instructions for Spaghetti Squash Au Gratin
Step 1: Preheat the Oven
Begin by preheating your oven to 375°F (190°C). This ensures a perfectly baked Spaghetti Squash Au Gratin. While the oven heats, gather your ingredients and prepare your baking sheet with parchment paper, making cleanup easier later.
Step 2: Prepare the Spaghetti Squash
Cut the spaghetti squash in half lengthwise and scoop out the seeds with a spoon. Brush the inside with olive oil and season generously with salt and pepper. Place them cut-side down on the prepared baking sheet, creating a cozy nest where they will roast beautifully until tender.
Step 3: Season and Bake the Chicken
Cut your chicken breast into four pieces and season with salt and pepper. Place the chicken pieces on the same baking sheet as the squash. Slide the baking sheet into your preheated oven and bake for about 45 minutes, or until the squash is fork-tender and the chicken is cooked through and juicy.
Step 4: Sauté Onions and Garlic
While the squash and chicken bake, melt butter in a skillet over medium-low heat. Add the diced onion and sauté until softened and translucent, about 5 minutes. Stir in the grated garlic and cook for another minute, just until fragrant. This flavorful mixture will elevate your Spaghetti Squash Au Gratin.
Step 5: Scrape and Combine Ingredients
Once your chicken and squash are ready, remove them from the oven. Using a fork, scrape the flesh of the spaghetti squash into strands, resembling noodles. Dice the cooked chicken into bite-sized pieces. In a large mixing bowl, combine the spaghetti squash strands, diced chicken, sautéed onions, Greek yogurt, 1 cup of cheese, salt, and pepper. Mix thoroughly to blend flavors.
Step 6: Fill the Squash Shells
Carefully spoon the mixture back into the empty spaghetti squash shells, ensuring an even distribution. Top each filled squash half with the remaining cheese, creating a delightful cheesiness that will melt beautifully.
Step 7: Broil for Golden Perfection
Place the loaded squash halves under the broiler for about 3-5 minutes. Keep a close eye as the cheese melts and turns golden brown; this will give your Spaghetti Squash Au Gratin that irresistible creamy crust.
Step 8: Serve and Enjoy
Once the cheese is beautifully golden, carefully remove the squash from the oven. Let it sit for a few minutes to cool slightly before serving. This warm, cheesy Spaghetti Squash Au Gratin will be ready to delight your family with its comforting flavors and satisfying texture!

Storage Tips for Spaghetti Squash Au Gratin
Fridge: Store leftovers in an airtight container for up to 3 days. This keeps your Spaghetti Squash Au Gratin fresh and ready for a quick meal.
Freezer: For longer storage, freeze in a freezer-safe container for up to 3 months. Just ensure it’s tightly sealed to prevent freezer burn.
Reheating: To reheat, thaw first if frozen, then place in the oven at 350°F (175°C) until warmed through, about 20-30 minutes for best texture.
Room Temperature: Allow any leftovers to cool before storing. Avoid leaving it out for more than 2 hours to ensure food safety.
Expert Tips for Spaghetti Squash Au Gratin
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Sharp Knife Safety: Use a sharp knife when cutting the spaghetti squash. This makes it easier to cut and reduces the risk of injury.
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Garlic Adjustment: If you’re a garlic lover, feel free to increase the amount used! Just remember that too much can overpower the dish.
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Make Ahead: Prep steps 1-6 in advance and refrigerate. Just pop it in the oven when you’re ready for a cozy dinner without last-minute stress.
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Cooking Method Flexibility: If you’re short on time, you can microwave the spaghetti squash instead of baking—it still results in lovely strands!
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Flavor Variations: Customize your Spaghetti Squash Au Gratin by adding herbs like thyme or rosemary, or by including vibrant vegetables such as bell peppers or spinach for extra nutrition.
What to Serve with Spaghetti Squash Au Gratin
Elevate your meal by pairing this creamy delight with tantalizing sides that enhance its comforting flavors.
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Mixed Greens Salad: A light, refreshing salad brightens each bite, balancing the rich cheese while adding crunch. Toss in some cherry tomatoes and feta for extra flavor.
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Grilled Asparagus: The smoky char from grilled asparagus complements the dish’s creaminess, providing a lovely contrast in texture. Drizzle with balsamic for an acidic kick.
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Garlic Bread: This classic favorite adds a garlic zing and a satisfying crunch that pairs perfectly with the creamy au gratin. Just be sure to use a low-carb bread if you’re following a keto plan!
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Roasted Brussels Sprouts: The nutty flavor of roasted Brussels sprouts enhances the overall meal experience. Their crispy edges provide a delightful textural contrast to the creamy dish.
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Berry Smoothie: A fruity smoothie can cleanse the palate beautifully. Opt for blueberries and spinach blended with almond milk for a nutritious drink.
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Zucchini Noodles: For a complete low-carb experience, serve alongside zucchini noodles tossed in olive oil and herbs. They mimic pasta while keeping the meal light and flavorful.
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Chardonnay: A chilled glass of Chardonnay pairs wonderfully, its fruity notes complementing the richness of the cheese while enhancing the dish’s flavors.
Make Ahead Options
These Spaghetti Squash Au Gratin are a fantastic option for meal prep enthusiasts! You can complete steps 1-6 up to 24 hours in advance by preparing the squash and chicken, sautéing the onions and garlic, and mixing everything together. Simply refrigerate the mixture in an airtight container until you’re ready to finish the dish. When it’s time to serve, preheat the oven, spoon the mixture back into the squash shells, and top with cheese. Broil for just a few minutes to achieve that irresistible golden crust. This make-ahead strategy saves time on busy weeknights while ensuring your Spaghetti Squash Au Gratin is just as delicious!
Variations & Substitutions for Spaghetti Squash Au Gratin
Feel free to get creative with this Spaghetti Squash Au Gratin! The possibilities are endless, and each tweak can turn it into something uniquely delightful.
- Meatless: Substitute the chicken with lentils or chickpeas for a hearty, plant-based option that’s still satisfying and protein-packed.
- Vegetable Boost: Add spinach, zucchini, or bell peppers to the mix for extra nutrition and flavor. Your dish will burst with color and taste!
- Spicy Kick: Mix in some crushed red pepper flakes or jalapeños for a gentle heat that contrasts beautifully with the creamy cheese.
- Cheese Variations: Try mixing different cheeses like Gruyère or pepper jack for a more sophisticated flavor profile. Each cheese brings a unique twist!
- Dairy-Free: Use cashew cream and dairy-free cheese for an indulgent yet vegan-friendly alternative that everyone can enjoy.
- Herb Infusion: Fresh herbs like thyme, rosemary, or chives add a fragrant touch. Just a sprinkle can elevate the entire dish and bring freshness to every bite.
- Cauliflower Alternative: Swap out spaghetti squash with cauliflower rice for a lighter version while ensuring it’s just as comforting and delicious.
- Creaminess Level: Adjust the Greek yogurt to taste, or mix in a splash of heavy cream for a richer consistency if you’re feeling decadent.
As you savor the lovely aroma of your dish, consider serving it alongside a refreshing salad or pairing it with delightful sides like Garlic Butter Squash or Creamy Spaghetti Meatballs Warm for a complete meal! The options are limitless, and you’re bound to find the perfect match for your taste buds.

Spaghetti Squash Au Gratin Recipe FAQs
How do I choose the perfect spaghetti squash?
Absolutely! When selecting spaghetti squash, look for ones that feel heavy for their size with a firm skin. Avoid any squash with dark spots or soft spots, as these could indicate overripeness. A good spaghetti squash should have a smooth, intact surface and should feel solid when you gently press on it.
How should I store leftover Spaghetti Squash Au Gratin?
Store your leftovers in an airtight container in the fridge, where they’ll stay fresh for up to 3 days. Just make sure that the container is sealed tightly to keep out moisture and odors. For the best texture, reheat in the oven rather than the microwave to maintain that cheesy goodness!
Can I freeze Spaghetti Squash Au Gratin?
Very! To freeze, first let the dish cool completely. Then, transfer your Spaghetti Squash Au Gratin to a freezer-safe container or wrap it tightly in aluminum foil. It can be stored in the freezer for up to 3 months. When you’re ready to enjoy it, simply thaw in the refrigerator overnight and reheat in the oven at 350°F (175°C) for about 20-30 minutes until it’s heated through.
What if I don’t have plain Greek yogurt?
Not a problem! You can substitute plain Greek yogurt with an equal amount of sour cream or cream cheese for a rich and creamy alternative. If you’re looking for a lighter option, a cottage cheese blend can work well, too! Just blend it until smooth to mimic the creaminess of yogurt.
Can I make this recipe gluten-free?
Absolutely! This Spaghetti Squash Au Gratin is already gluten-free, as it doesn’t contain any traditional grains. However, always double-check that any additional ingredients, especially pre-packaged items like cheese or seasonings, are labeled gluten-free, particularly if you have a severe gluten allergy.
Is this recipe safe for pets?
While spaghetti squash is safe for pets in small amounts, other ingredients like garlic and onions can be harmful to dogs and cats. Therefore, it’s best to keep your Spaghetti Squash Au Gratin just for you and your family, ensuring your furry friends enjoy pet-safe treats instead!

Creamy Spaghetti Squash Au Gratin for a Guilt-Free Indulgence
Ingredients
Equipment
Method
- Preheat your oven to 375°F (190°C). Prepare your baking sheet with parchment paper.
- Cut the spaghetti squash in half lengthwise and remove the seeds. Brush with olive oil and season with salt and pepper before placing cut-side down on the baking sheet.
- Cut the chicken breast into pieces, season with salt and pepper, and place on the baking sheet. Bake for about 45 minutes.
- Melt butter in a skillet over medium-low heat. Sauté diced onions until softened, then add garlic and cook until fragrant.
- Once baked, scrape the spaghetti squash into strands and dice the chicken. Mix these with the sautéed onions, Greek yogurt, cheese, salt, and pepper.
- Spoon the mixture into the spaghetti squash shells, top with remaining cheese, and broil for 3-5 minutes.
- Remove from the oven, let cool slightly, and serve.
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