Jump to Recipe Print RecipeAs I stood in the kitchen, the warm aroma of sautéing onions and garlic wrapped around me like a cozy blanket, I knew I was about to create something special. Enter the Spaghetti Squash Au Gratin—a healthy twist on a classic comfort food that’s sure to impress. With the natural sweetness of spaghetti squash encapsulated in a creamy cheese sauce and topped with a crisp, golden crust, this dish blends delicious flavors with guilt-free satisfaction. Perfect for a quick weeknight dinner or an elegant gathering, it’s a crowd-pleaser that doesn’t skimp on comfort. Plus, it’s easily adaptable for vegetarian and gluten-free diets! Are you ready to redefine indulgence? Let’s dive into this savory delight! Why is Spaghetti Squash Au Gratin Amazing? Comforting Indulgence: This dish delivers all the warmth and satisfaction of traditional au gratin recipes, but with a healthy twist that makes it guilt-free. Easy to Make: Whether you’re a seasoned chef or a kitchen novice, the straightforward steps ensure you whip this up with ease. Versatile Options: Feel free to customize it! Add your favorite proteins, like chicken or sausage, or include extra veggies for a heartier meal. Nutritious Choice: Packed with fiber and vitamins from the spaghetti squash, it’s a fantastic way to enjoy a healthy meal without sacrificing flavor. Crowd-Pleasing Flavor: Rich, cheesy goodness topped with a crispy breadcrumb layer makes this dish a surefire hit at any gathering or family dinner. Explore more delightful dishes like these Mini Spaghetti Meatball Bites for more crowd-pleasing ideas! Spaghetti Squash Au Gratin Ingredients • Everything you need for cheesy goodness! For the Base Spaghetti Squash – The star of the dish, offering a tender and subtly sweet texture. Choose one that feels heavy for its size! Unsalted Butter – Adds a rich, creamy flavor; can be replaced with olive oil for a dairy-free option. For the Flavor Yellow Onion – Sautéed to provide savory depth and sweetness; shallots can be a milder alternative. Garlic – Fresh garlic infuses the dish with aromatic notes; garlic powder works in a pinch. For the Sauce All-Purpose Flour – Thicken your cheese sauce effectively; opt for a gluten-free flour blend as a substitute if needed. Whole Milk – Creates a wonderfully creamy base; lower fat can be achieved with 2% or plant-based milk. Nutmeg – A pinch adds warmth and elevates the cheese flavor, making it extra comforting. Salt & Black Pepper – Essential for enhancing flavors; adjust according to your taste preference. For the Cheesy Goodness Gruyere Cheese – Offers a rich, nutty taste that pairs beautifully with the squash; Swiss cheese is a great substitute. Sharp Cheddar Cheese – Brings tanginess and color; mixing different cheddars can add a delightful complexity. Parmesan Cheese – Adds depth and umami; consider nutritional yeast as a vegan alternative if desired. For the Crunchy Topping Panko Breadcrumbs – Provides a satisfying crunch; whole wheat or gluten-free panko can be perfect substitutes. Fresh Parsley – An optional garnish to enhance color and freshness on the plate! With these ingredients ready, you’re well on your way to creating a sensational Spaghetti Squash Au Gratin! Step‑by‑Step Instructions for Spaghetti Squash Au Gratin Step 1: Preheat the Oven Begin by preheating your oven to 400°F (200°C). This temperature is perfect for roasting your spaghetti squash, ensuring it becomes tender and sweet while creating a lovely caramelization. Meanwhile, gather your baking sheet and prepare it for the next step with a bit of non-stick spray or parchment paper for easy cleanup. Step 2: Prepare the Spaghetti Squash Carefully cut the spaghetti squash in half lengthwise and scoop out the seeds using a spoon. Drizzle the cut sides with 2 tablespoons of melted unsalted butter, and season with a sprinkle of salt and black pepper. Make sure the squash is well-coated for optimal flavor, then place it cut-side down on the prepared baking sheet to retain moisture while roasting. Step 3: Roast the Squash Roast the spaghetti squash in your preheated oven for 45–60 minutes, or until the flesh is fork-tender and can easily be shredded into strands. Keep an eye on it towards the end; you want a golden color forming on the skin. Once done, remove it from the oven and set it aside to cool slightly for safe handling. Step 4: Shred the Squash After allowing it to cool for a few minutes, use a fork to carefully shred the spaghetti squash flesh into strands. This process transforms your squash into the noodle-like texture that defines this dish. Set the shredded squash aside in a large mixing bowl and prepare to make the creamy cheese sauce for your Spaghetti Squash Au Gratin. Step 5: Sauté the Aromatics In a medium saucepan, melt the remaining unsalted butter over medium heat. Add the chopped yellow onion and sauté for about 5–7 minutes, stirring occasionally, until it becomes translucent and fragrant. Next, add in the minced garlic and sauté for another minute until it’s aromatic, but be careful not to let it burn! Step 6: Make the Roux Stir in the all-purpose flour to create a roux, cooking for 1-2 minutes while whisking continuously. This step is crucial for thickening your cheese sauce, so make sure the flour is well incorporated and slightly bubbling but not browned. The roux should look smooth and slightly golden, filling your kitchen with a warm, inviting scent. Step 7: Create the Cheese Sauce Gradually whisk in the whole milk, stirring constantly until the mixture is smooth and starts to thicken. Allow it to simmer gently for about 5–7 minutes, keeping an eye on the consistency. It should coat the back of a spoon by this point, becoming a luscious, creamy base for your Spaghetti Squash Au Gratin. Step 8: Cheese It Up Season the sauce with salt, black pepper, and a pinch of nutmeg for added warmth. Reduce the heat to low and stir in most of the Gruyere and sharp cheddar cheeses until they melt completely, creating a velvety sauce. Save a little cheese for the topping later. The delightful aroma will signal you that it’s ready to mix with the squash. Step 9: Combine Squash and Sauce Gently fold the shredded spaghetti squash into the cheesy sauce until evenly coated. Transfer the mixture into a greased baking dish, spreading it out evenly. This is where the magic of the Spaghetti Squash Au Gratin begins to take shape, as the rich flavors blend beautifully together in the dish. Step 10: Prepare the Topping In a small bowl, combine the reserved cheeses with the panko breadcrumbs. Mix thoroughly until the breadcrumbs are well-coated in cheese, creating that irresistible crunchy topping. Evenly sprinkle this mixture over the spaghetti squash and cheese layer in your baking dish to achieve a delightful, golden crust. Step 11: Bake to Perfection Pop your assembled Spaghetti Squash Au Gratin into the oven and bake for 20–25 minutes or until the top is golden and bubbly. The cheese layer should be slightly crispy, creating an appealing contrast to the creamy filling underneath. Enjoy the wonderful aromas wafting through your kitchen as it bakes! Step 12: Rest and Garnish Once baked, remove the dish from the oven and let it rest for about 5–10 minutes before serving. This resting time allows the flavors to settle and makes for easier serving. Consider garnishing with freshly chopped parsley for a pop of color and a hint of freshness that elevates your beautiful Spaghetti Squash Au Gratin to the next level. Spaghetti Squash Au Gratin Variations Feel free to explore these delightful twists on your comforting dish to create something uniquely yours! Dairy-Free: Substitute butter and cheese with plant-based options for a creamy, non-dairy version. Extra Veggies: Add sautéed spinach or kale to boost the nutrition and flavor. The greens add a vibrant color and earthy taste. Protein-Packed: Mix in shredded chicken or crumbled turkey sausage for a hearty meal. These proteins make it satisfying for the whole family. Cheese Lovers: Experiment with a blend of Gouda and Havarti cheeses for added creaminess. Let your cheese cravings lead the way! Gluten-Free: Use a gluten-free flour blend to thicken your sauce, ensuring it stays celiac-friendly and delicious. Spicy Kick: Add a touch of diced jalapeños or cayenne pepper to the cheese mixture for a fiery twist. It brings a flavor punch to every bite. Herb Infusion: Toss in fresh herbs like thyme or rosemary into the cheese sauce for a fragrant upgrade. It elevates the dish to a new level of flavor. Smoky Flavor: Incorporate smoked paprika into the cheese mixture for a hint of smokiness. It pairs beautifully with the squash’s natural sweetness. Explore more delicious options and ideas for variations in recipes such as these tempting Mini Spaghetti Meatball Bites—your taste buds will thank you! Make Ahead Options These Creamy Spaghetti Squash Au Gratin are ideal for meal prep, allowing you to enjoy this comforting dish without the last-minute rush! You can roast and shred the spaghetti squash up to 24 hours in advance, storing it in an airtight container in the refrigerator. Additionally, the cheese sauce can be prepared ahead by making it and refrigerating for up to 3 days; just remember to cover it tightly to maintain its creamy texture. When ready to serve, combine the squash and sauce, transfer to your baking dish, and top with breadcrumbs and cheese before baking. This way, you’ll achieve the same delicious, crispy topping and save valuable time during your busy week! Tips for the Best Spaghetti Squash Au Gratin Avoid Overcooking: Prevent mushiness by roasting the spaghetti squash until fork-tender; check for tenderness towards the 45-minute mark. Quality Cheese Matters: Using high-quality Gruyere and sharp cheddar will elevate the flavor and texture of your Spaghetti Squash Au Gratin. Make-Ahead Friendly: You can assemble this dish a day in advance. Just refrigerate it and add a few extra minutes to the baking time when you’re ready to enjoy! Spice It Up: For an extra kick, consider adding red pepper flakes into the cheese sauce or incorporating sliced jalapeños. Mix It Up: Feel free to get creative! Adding sautéed mushrooms or spinach can enhance both flavor and nutrition in your dish. What to Serve with Spaghetti Squash Au Gratin Elevate your dining experience by pairing this indulgent dish with complementary flavors and textures. Grilled Chicken: The smoky, charred flavor of grilled chicken balances the creamy richness, making it a satisfying protein addition. Arugula Salad: A light, peppery salad with a citrus vinaigrette adds a refreshing contrast, cutting through the dish’s richness beautifully. Garlic Bread: Crunchy, buttery garlic bread provides a delightful crunch, enhancing your meal’s comfort and perfect for mopping up the cheesy goodness. Roasted Vegetables: Colorful, caramelized veggies like broccoli or bell peppers introduce sweetness and earthiness, enriching the overall flavor profile. Red Wine: A glass of light-bodied red wine, such as Pinot Noir, complements the dish’s creamy notes and rounds out the meal beautifully. Baked Sweet Potatoes: The natural sweetness of baked sweet potatoes adds a lovely depth, while their soft texture contrasts with the gratin’s crunch. Whether you opt for a refreshing salad or a warm garlic bread side, these pairings will create a well-rounded and memorable meal. Storage Tips for Spaghetti Squash Au Gratin Fridge: Store leftovers in an airtight container in the refrigerator for up to 3-4 days. Allow it to cool completely before sealing to maintain texture. Freezer: Freeze portions of the Spaghetti Squash Au Gratin in airtight containers for up to 3 months. Thaw in the fridge overnight before reheating for the best quality. Reheating: Reheat in the oven at 350°F (175°C) for about 20-25 minutes, or until warmed through. This ensures the cheese stays creamy and the topping remains crispy. Make-Ahead: You can prepare the dish ahead of time and refrigerate it for up to 24 hours. Just add extra baking time if cooked straight from the fridge. Spaghetti Squash Au Gratin Recipe FAQs How do I choose the right spaghetti squash? Look for a spaghetti squash that feels heavy for its size and is free from blemishes or dark spots. A fresh squash will have a firm exterior and a smooth surface. Ideally, choose one that has a bright, golden color for the best taste and texture. How should I store leftover spaghetti squash au gratin? Store leftovers in an airtight container in the refrigerator for up to 3-4 days. Allow the dish to cool completely before sealing to preserve the texture of the creamy sauce and crunchy topping. Can I freeze spaghetti squash au gratin? Absolutely! You can freeze portions of the Spaghetti Squash Au Gratin in airtight containers for up to 3 months. For best results, thaw in the fridge overnight before reheating. When ready to enjoy, reheat at 350°F (175°C) for about 20-25 minutes until warmed through. What should I do if my cheese sauce is too thick? If your cheese sauce is too thick, there’s no need to worry! Gradually whisk in a little more milk or some broth over low heat, stirring continuously until you reach your desired consistency. This will help your sauce become smooth and creamy again without compromising the flavor. Is this recipe suitable for those with dietary restrictions? Yes! You can easily adapt this Spaghetti Squash Au Gratin for dietary needs. For a gluten-free version, simply use a gluten-free flour blend and panko. You can substitute plant-based milk and use dairy-free cheese alternatives to make it dairy-free. Always check labels for allergies if you’re cooking for someone with specific dietary restrictions. How can I make spaghetti squash au gratin more flavorful? Get creative with flavors! For an extra kick, consider adding a pinch of red pepper flakes to the cheese sauce or incorporating sautéed mushrooms and spinach into the mixture. Fresh herbs like thyme or basil can also elevate the flavor profile, giving it an aromatic touch that pairs beautifully with the cheesy goodness. Creamy Spaghetti Squash Au Gratin to Delight Your Tastebuds A healthy twist on classic comfort food, Spaghetti Squash Au Gratin blends delicious flavors with guilt-free satisfaction. Print Recipe Pin Recipe Prep Time 15 minutes minsCook Time 1 hour hrResting Time 10 minutes minsTotal Time 1 hour hr 25 minutes mins Servings: 6 servingsCourse: DinnerCuisine: AmericanCalories: 360 Ingredients Equipment Method Nutrition Notes Ingredients 1x2x3x? For the Base1 medium Spaghetti Squash Choose one that feels heavy for its size!2 tablespoons Unsalted Butter Can be replaced with olive oil for dairy-free.For the Flavor1 medium Yellow Onion Can be substituted with shallots.2 cloves Garlic Fresh is best; can use garlic powder in a pinch.For the Sauce2 tablespoons All-Purpose Flour Use gluten-free flour if needed.2 cups Whole Milk Lower fat can be achieved with 2% or plant-based milk.1 pinch Nutmeg1 to taste Salt1 to taste Black PepperFor the Cheesy Goodness1 cup Gruyere Cheese Swiss cheese can be a good substitute.1 cup Sharp Cheddar Cheese Mixing different cheddars adds complexity.1/2 cup Parmesan Cheese Nutritional yeast can be a vegan alternative.For the Crunchy Topping1 cup Panko Breadcrumbs Whole wheat or gluten-free panko can be used.2 tablespoons Fresh Parsley Optional for garnish. Equipment OvenMedium SaucepanBaking sheetMixing bowlWhiskKnifespoon Method Step-by-Step InstructionsPreheat your oven to 400°F (200°C).Cut the spaghetti squash in half lengthwise, scoop out the seeds, and drizzle the cut sides with melted butter and season with salt and pepper.Roast the squash in the preheated oven for 45–60 minutes until fork-tender.Shred the cooked squash flesh into strands and set aside in a mixing bowl.In a saucepan, melt remaining butter, sauté onion until translucent, then add garlic and sauté for another minute.Stir in flour to create a roux, cooking for 1-2 minutes.Gradually whisk in the milk and simmer until thickened, about 5–7 minutes.Season with salt, pepper, and nutmeg, then stir in most of the Gruyere and cheddar until melted.Fold the shredded squash into the cheese sauce, then transfer to a greased baking dish.Mix reserved cheeses with breadcrumbs, sprinkle over the top, and bake for 20–25 minutes until golden and bubbly.Let rest for 5–10 minutes before serving and garnish with parsley if desired. Nutrition Serving: 1servingCalories: 360kcalCarbohydrates: 35gProtein: 15gFat: 20gSaturated Fat: 10gPolyunsaturated Fat: 2gMonounsaturated Fat: 6gCholesterol: 50mgSodium: 450mgPotassium: 600mgFiber: 5gSugar: 3gVitamin A: 15IUVitamin C: 20mgCalcium: 25mgIron: 10mg NotesQuality cheese significantly enhances flavor and texture. You can make this dish a day ahead and refrigerate before adding extra baking time. Tried this recipe?Let us know how it was!