Flavorful Paleo & Gluten-Free Squash Au Gratin: Your New Favorite Fall Side Dish

As the crisp air of autumn rolls in, signaling cozy evenings and comforting meals, our palates often crave dishes that are both hearty and healthy. This Squash Au Gratin recipe is precisely that – a delightful, grain-free, and dairy-free casserole bursting with the vibrant flavors of fall butternut squash and zucchini, all crowned with a savory crunch of plantain chips.

Elevating Your Side Dish Game

For many of us, the main course often takes center stage, leaving side dishes as an afterthought. While simple roasted vegetables are always a great option, sometimes you want something more inventive, something that truly complements your meal and makes it feel complete. This recipe answers the call for a “healthy something else” on your plate, moving beyond basic sides to a truly show-stopping vegetable casserole.

Imagine a creamy, rich gratin — traditionally laden with cheese and heavy cream — transformed into a paleo-friendly, dairy-free masterpiece. That’s exactly what this Squash Au Gratin delivers. It’s made with a harmonious blend of tender zucchini, sweet yellow squash, and earthy butternut squash, all bound together by a luscious, dairy-free sauce. The unexpected crunch of crumbled plantain chips on top adds a textural contrast that elevates this dish from simple to spectacular. It’s not just a side; it’s a celebration of seasonal produce, perfect for any fall gathering or weeknight dinner.

Why This Squash Au Gratin?

This recipe isn’t just delicious; it’s a testament to how flavorful healthy eating can be. Here’s why this Squash Au Gratin should be on your must-try list this season:

• Paleo and Gluten-Free: Ideal for those following a Paleo lifestyle or needing gluten-free options. It proves that you don’t have to sacrifice flavor or texture to meet your dietary needs. The coconut cream provides a rich, dairy-free alternative to traditional gratin sauces.
• Dairy-Free Delight: Enjoy a creamy, indulgent gratin without any dairy. Coconut cream is a fantastic plant-based substitute that lends a subtle sweetness and velvety texture to the sauce, making it incredibly satisfying.
• Seasonal & Nutrient-Rich: Packed with the goodness of butternut squash, zucchini, and yellow squash, this dish is a powerhouse of vitamins, minerals, and fiber. Butternut squash is particularly rich in Vitamin A, while zucchini offers a good dose of Vitamin C.
• Comfort Food Remastered: It offers all the comforting warmth of a classic au gratin, but with a lighter, healthier twist. It’s the perfect dish to bring to a potluck or serve at your holiday table, impressing guests with both its taste and dietary inclusiveness.
• Unique Topping: The crumbled plantain chips aren’t just for show. They provide an irresistible salty, crispy topping that beautifully contrasts with the soft, creamy squash layers below, adding an unexpected depth of flavor and texture.

Ingredients Overview

Crafting this savory squash gratin requires a selection of fresh vegetables and pantry staples. Each component plays a crucial role in building the layered flavors and comforting texture of the dish. Here’s a closer look at what you’ll need, along with a few tips for selection and preparation.

• Zucchini: Opt for firm, medium-sized zucchini. Their mild flavor and tender texture are perfect for layering.
• Yellow Squash: Similar to zucchini, yellow squash adds a slightly sweeter note and a beautiful color contrast.
• Butternut Squash: The star of the show! Choose a firm, unblemished butternut squash. Its natural sweetness and creamy texture when cooked are essential for the gratin’s richness. Pre-cooking it slightly helps ensure even doneness.
• White Onion & Garlic: These aromatic vegetables form the flavor base of our creamy sauce, providing a pungent, savory depth.
• Olive Oil: Used for sautéing the aromatics and greasing the baking dish. A good quality olive oil enhances the overall taste.
• Coconut Flour: This gluten-free flour acts as a thickener for the dairy-free sauce, providing a smooth consistency without lumps.
• Coconut Cream: Crucial for the creamy, dairy-free sauce. Look for full-fat coconut cream (or the thick cream separated from a can of full-fat coconut milk) with minimal additives for the best results. Brands like Savoy are often praised for their purity and flavor.
• Salt, Pepper, Nutmeg, Dried Thyme: These seasonings bring the sauce to life. Nutmeg complements the squash beautifully, while thyme adds an earthy, aromatic touch.
• Chicken Broth/Stock: Adds depth of flavor to the sauce. For a vegetarian/vegan version, use vegetable broth.
• Crushed/Crumbled Plantain Chips: The unique topping that provides a delightful crunch. Trader Joe’s brand is a popular paleo-friendly option. Ensure they are unsweetened for a savory topping.

Step-by-Step Instructions for a Perfect Squash Au Gratin

Follow these detailed steps to create a show-stopping, healthy Squash Au Gratin that will impress everyone at your table. Precision in preparation leads to perfection in flavor and texture.

Step 1: Prepare the Butternut Squash

Begin by preheating your oven to 400 degrees Fahrenheit (200°C). Then, carefully slice your butternut squash into 1/2-inch thick rounds. Remove the outer peel from each slice. Next, halve and quarter each slice to create manageable pieces. Finally, slice each quartered piece in half again, aiming for approximately 1/4-inch thick pieces. This meticulous slicing ensures that the butternut squash cooks evenly and blends seamlessly with the other vegetables. You should end up with about 2 cups of these prepared butternut squash pieces. Place them in a microwave-safe bowl with 1 cup of water and microwave for 5 minutes. This pre-cooking step softens the squash, significantly reducing its baking time in the oven. Once microwaved, drain the water thoroughly and set the squash aside.

Step 2: Create the Creamy Paleo Sauce

In a medium pan or pot, heat 1 tablespoon of olive oil over medium heat. Add the diced white onion and diced garlic, sautéing for about 4 minutes until they become fragrant and translucent. Stir in 1 tablespoon of coconut flour with the onions and garlic, mixing well to form a paste. Pour in 1 cup of coconut cream, then add the salt, ground black pepper, ground nutmeg, and dried thyme. Stir thoroughly and cook for another 5 minutes, allowing the flavors to meld. Next, incorporate 1/2 cup of chicken broth (or vegetable broth for a vegan option) and the remaining 1 tablespoon of coconut flour. Mix until smooth, then continue to cook for 5 more minutes. Increase the heat to medium-high and let the mixture gently bubble for 3 minutes, stirring frequently, until the sauce thickens to a rich, creamy consistency. Set the sauce aside.

Step 3: Layer the Squash in a Baking Dish

Lightly grease an 8×8-inch (or similar sized) glass baking dish. Arrange approximately one-third of your sliced zucchini, sliced yellow squash, and the pre-cooked butternut squash evenly across the bottom of the dish. This creates the first foundational layer of your gratin, ensuring every bite is full of diverse squash flavors and textures.

Step 4: Add Sauce and Repeat Layers

Pour about 1/2 cup of the creamy paleo sauce over the first layer of squash. Gently spread the sauce to ensure it evenly coats all the vegetables. This step is crucial for infusing flavor throughout the gratin. Repeat this layering process: add another third of the mixed squash, followed by another 1/2 cup of sauce. Finish with the remaining squash, and top with the last portion of the sauce, smoothing it over the top to create a beautiful, even surface before baking.

Step 5: Bake and Broil for a Golden Finish

Place the layered squash dish into your preheated 400-degree Fahrenheit (200°C) oven and bake for 35 minutes. After baking, carefully remove the dish from the oven. To achieve a beautiful golden-brown top, set your oven to broil at 500 degrees Fahrenheit (260°C) and broil the gratin for 2-3 minutes. Keep a close eye on it during this step to prevent burning, as broilers can vary significantly in intensity. Once the top is lightly golden, remove the dish from the oven.

Step 6: Garnish and Serve

Immediately after removing the gratin from the oven, generously sprinkle the crushed plantain chips over the entire top. The residual heat will help them adhere slightly and warm through. Allow the dish to cool for a few minutes before serving. This brief cooling period helps the layers set and makes for easier, cleaner serving. Enjoy this hearty and healthy fall side dish!

Tips and Variations for Your Squash Au Gratin

While this recipe is fantastic as written, there are many ways to customize it to your taste or what you have on hand. Here are some tips and variations to inspire you:

• Vegetable Swaps: Feel free to experiment with other fall squashes like delicata or acorn squash. Ensure they are cut to similar thickness as the butternut squash for even cooking. You could also add thinly sliced sweet potatoes for extra sweetness and heartiness.
• Herb Enhancements: Beyond thyme, consider adding fresh rosemary, sage, or a pinch of marjoram to the sauce for an elevated aromatic profile.
• Spice It Up: For a touch of heat, a tiny pinch of cayenne pepper or red pepper flakes in the sauce can add a delightful kick.
• Nutritional Yeast for Cheesy Flavor: If you miss the cheesy flavor but need to stay dairy-free, add a few tablespoons of nutritional yeast to the sauce. It provides a savory, umami note reminiscent of cheese.
• Crunchy Topping Alternatives: If plantain chips aren’t available, or you prefer a different crunch, consider crumbled bacon bits (ensure they are paleo-friendly), toasted pumpkin seeds, or even a mix of gluten-free breadcrumbs (if not strictly paleo) lightly tossed with olive oil and baked until crispy.
• Broth Options: While chicken broth adds depth, vegetable broth works just as well if you’re aiming for a vegetarian or vegan version. Bone broth can add extra nutrients.

Serving Suggestions

This Paleo & Gluten-Free Squash Au Gratin is incredibly versatile and pairs wonderfully with a variety of main dishes. It’s hearty enough to be a standalone light meal, especially if you add some protein to the layers, but truly shines as a side. Here are some ideas:

• Roasted Meats: Serve alongside roasted chicken, turkey, or a tender pork loin. Its creamy texture and savory notes perfectly complement rich meats.
• Grilled Fish: A lighter option like grilled salmon or cod would be beautifully balanced by the gratin’s comforting flavors.
• Steak: For a more substantial meal, pair it with a perfectly seared steak.
• Holiday Spreads: This gratin is an excellent addition to Thanksgiving or Christmas dinners, offering a healthy yet indulgent alternative to traditional holiday sides.
• Green Salad: Keep it simple with a fresh, crisp green salad dressed with a light vinaigrette for a balanced meal.

Storage and Make Ahead

This gratin is excellent for meal prepping or enjoying leftovers. Here’s how to handle it:

• Storing Leftovers: Any leftover gratin can be stored in an airtight container in the refrigerator for up to 3-4 days. The plantain chips might lose some of their crispness, but the flavor will still be fantastic.
• Reheating: Reheat individual portions in the microwave or a larger portion in the oven at 350°F (175°C) until heated through. If reheating in the oven, you might want to add a fresh sprinkle of plantain chips for renewed crunch.
• Make Ahead: You can prepare the gratin up to the point of baking. Assemble all the layers in the baking dish, cover it tightly with plastic wrap, and refrigerate for up to 24 hours. When ready to bake, let it sit at room temperature for about 20-30 minutes before baking, then follow the baking instructions, adding a few extra minutes to the baking time if it’s still very cold. Add the plantain chips just before serving.

Frequently Asked Questions

Can I make this recipe completely vegan?

Yes, absolutely! Simply ensure you use vegetable broth instead of chicken broth in the sauce. All other ingredients are naturally vegan.

What if I can’t find plantain chips?

While plantain chips offer a unique flavor, you can substitute them with other crunchy toppings. Crumbled gluten-free crackers (if not strictly paleo), toasted pumpkin seeds, or even a sprinkle of chopped toasted nuts like pecans or walnuts can work as an alternative.

Can I use frozen squash?

It’s best to use fresh squash for the optimal texture and flavor in this gratin. Frozen squash can release a lot of water, which might make the gratin watery. If you must use frozen, thaw it completely and pat it very dry before layering.

Is this dish spicy?

No, this recipe is not spicy. The spices used (nutmeg, thyme, salt, pepper) are for warmth and aroma. If you prefer a spicy kick, feel free to add a pinch of red pepper flakes to the sauce.

Other Squash Recipes You’ll Love

If you enjoy the versatility and comforting qualities of squash, here are more delicious recipes featuring this amazing autumn vegetable:

Did you try this recipe? Please leave us a ⭐ review below! Your feedback helps others discover delicious healthy meals.

Rated 5 out of 5 stars from 1 review

Squash Au Gratin (Paleo, GF)

By: Dominique

Servings: 6

Prep: 15 mins

Cook: 40 mins

Total: 55 mins

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Layers of zucchini, yellow squash, and butternut squash cooked up in a cream sauce for a paleo side dish perfect for dinner.

Ingredients

• 1 zucchini, sliced
• 1 yellow squash, sliced
• 1/2 of a small butternut squash (I used 1/2 of a 1.72 lb butternut squash)
• 1 Tbs olive oil
• 1/2 cup of diced white onion
• 2.5-3 Tbs diced garlic
• 2 Tbs coconut flour, divided (I like Nutiva)
• 1 cup coconut cream (I used Savoy because it has no preservatives and tastes best)
• 1 tsp salt
• 1/2 tsp ground black pepper
• 1/4 tsp ground nutmeg
• 1/2 tsp dried thyme
• 1/2 cup chicken broth/stock
• 3/4 cup of crushed/crumbled plantain chips (Trader Joes brand is my favorite, and Paleo)

Instructions

1. Preheat your oven to 400 degrees Fahrenheit (200°C).
2. Cut 1/2 inch slices of your butternut squash, then cut off the outer skin from each slice. Then cut these slices in half and quarters. Slice each quartered piece in half (this makes it easier to get 1/4 inch slices of butternut squash). You will end up with about 2 cups of sliced and quartered pieces of butternut squash. Then, put the butternut squash into a microwave safe bowl. Pour 1 cup of water into the bowl and microwave for 5 minutes. Strain and set aside.
3. Next, sauté the diced white onion and diced garlic in 1 Tbs of olive oil in a pan/pot for about 4 minutes over medium heat. Add 1 Tbs of coconut flour to the onions and garlic and mix.
4. Then, add 1 cup of coconut cream to the pot and mix. Add the salt, black pepper, nutmeg, and thyme to the pot, mix, and cook for 5 minutes. Add 1/2 cup of chicken broth or stock and 1 Tbs of coconut flour to the pot, mix, and cook for another 5 minutes. Then increase the heat to medium high and let the mixture bubble for 3 minutes, while mixing often, and set aside.
5. Next, grease a glass dish, mine was 8in x 8 in. Put 1/3 of the sliced zucchini, sliced yellow squash and the microwaved butternut squash into the dish. Top with 1/2 cup of the sauce, smoothing it around to touch all of the squash. Then add the next 1/3 of the sliced zucchini, sliced yellow squash and sliced butternut squash into the pan and top it again with 1/2 cup of the sauce. Repeat this step with the remaining squash and sauce.
6. Cook in the oven for 35 minutes. Then, broil at 500 for 2-3 mins, and remove from the oven. Top the whole dish with with crushed plantain chips, let cool, and serve.

Nutrition

Calories: 238kcal
Carbohydrates: 22g
Protein: 4g
Fat: 17g
Saturated Fat: 13g
Polyunsaturated Fat: 0.5g
Monounsaturated Fat: 2g
Cholesterol: 0.4mg
Sodium: 475mg
Potassium: 663mg
Fiber: 4g
Sugar: 7g
Vitamin A: 7376IU
Vitamin C: 32mg
Calcium: 59mg
Iron: 2mg

Nutrition information is automatically calculated, so should only be used as an approximation.

Additional Info

Course: Side Dish

Cuisine: American, Paleo