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Sandra Valvassori

Sandra Valvassori

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Home โ€บ Side dish

Butternut Squash Gratin

Posted: November 11, 2022 | by Sandra Valvassori
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Everyone is sure to love this savoury-sweet Butternut Squash Gratin that screams Thanksgiving and Christmas. Oozing with creamy cheese and a crunchy bread crumb topping, I guarantee it will be the hit at your holiday table or any special occasion meal.

Close-up of spoon scooping out a piece of butternut squash gratin from baking dish

For our family, the appearance of this classic potato gratin for Thanksgiving dinner is nonnegotiable. But because we already celebrated Thanksgiving here in Canada, I have a little freedom to play with other holiday meals.

Not too dissimilar to a classic scallop potato dish, this gratin is instead made with thinly sliced butternut squash. But trust me, it is just as luscious, cheesy and deliciously creamy. Bonus that it cooks a lot faster than a potato gratin and it is also a great dish for making ahead.

Table of Contents[Hide]
  • Why You Will Love This Recipe
  • Ingredient Notes And Substitutions
  • How To Make Butternut Squash Gratin
  • How To Thinly Slice Butternut Squash
  • Make Ahead Instructions
  • Expert Tips
  • Storing Tips
  • What To Serve With Butternut Squash Gratin
  • More Thanksgiving Recipes To Try
  • Butternut Squash Gratin
    • Ingredients  1x2x3x
    • Instructions 
    • Notes
  • More Ideas

Brimming with comfort and coziness, this is the perfect side dish to a Sunday roast or the show-stopping centrepiece of your holiday table. I know you’re going to love it as much as we do.

Chives sprinkled over top of baked butternut squash gratin with small bowl of chives beside it

Why You Will Love This Recipe

This is one of those dishes that looks like it requires a lot of skill and effort when in fact it is incredibly adaptable and practically foolproof. It is adapted from Ina Garten, which is almost reason enough to know you’re going to love it.

I essentially swapped out the potatoes from this recipe for butternut squash, and used leeks instead of onions. Ina uses fennel with her potato gratin and here it works beautifully paired with the squash. I Know fennel can be polarizing but I urge you to give it a try. It really adds lovely warmth to the gratin and it helps cut through some of the sweetness of the squash. If you really dislike fennel, just omit it. The gratin will still be delicious.

Finally, the butternut squash gratin is baked with an outrageously delicious buttery, crunchy panko and pecan topping that makes it even more irresistible. Best of all, this dish comes together really fast, does not take too terribly long to bake, and leftovers are scrumptious for days.

ingredients to make recipe

Ingredient Notes And Substitutions

  • Butternut squash – You will need a large butternut squash for this recipe, weighing about 2 1/2 pounds.
  • Fennel – Thinly sliced and sautรฉed in olive oil and butter, the earthy, mildly-sweet, anise-like notes of fennel pairs beautifully with the leeks and butternut squash. Keep in mind when fennel is cooked, its anise flavour is toned down considerably. But as I mentioned before, if you truly dislike fennel, you can leave it out.
  • Leeks – Here leeks add a lovely depth of flavour to the gratin and are simply wonderful when smothered in cream and cheese. They are a little pricey at the moment so you can absolutely use a large yellow onion, if you prefer.
  • Garlic – Fresh garlic lends some intense savouriness to the dish.
  • Olive oil – For sautรฉing the fennel, leeks, and garlic.
  • Heavy cream – You really must use heavy cream here. Half-and-half or whole milk will not work as they could split and make the gratin taste greasy. If avoiding dairy, you could use full-fat canned coconut milk.
  • Gruyรจre – I pretty much always use Gruyรจre cheese in my gratins. It melts beautifully and has a rich and creamy, slightly nutty taste. You can also use Comtรฉ or any other good melting cheese such as Jarslberg, Fontina, or Emmental.
  • Parmesan – Not essential, but I love the salty, almost umami flavour it lends to this dish.
  • Fresh breadcrumbs or panko – I absolutely love the crunchy breadcrumb topping on this butternut squash gratin. Fresh breadcrumbs are always tastier, but panko breadcrumbs works just as well. Gluten-free panko is easy to find if you are avoiding gluten.
  • Salt and Pepper – Season with salt and pepper as you go. Like all starch-heavy dishes, this gratin needs plenty of seasoning.
  • Butter – Optional for greasing the pan and dotting the breadcrumb topping.
  • Pecans – Chopped pecans are a delicious crunchy topping on this gratin but I only add them for special occasions so feel free to omit them if avoiding nuts or if they are too expensive.
  • Chives – Optional, but they add a nice pop of colour.

How To Make Butternut Squash Gratin

Slicing the butternut squash thinly is important so it doesn’t take too long to cook. A sharp knife will make the job quick and easy. Likewise, the fennel should also be sliced really thin so it softens quickly when sautรฉed.

Here is an overview of the recipe. Full measurements and instructions can be found in the printable recipe card below.

  • Preheat the oven to 375ยบF. Grease a 8-ยฝ ร— 11-ยฝ-inch oval, or rectangular, shallow baking dish with butter.
  • Heat the olive oil and butter in a large skillet over medium heat. Sautรฉ the fennel and leeks with a little salt, tossing occasionally, until soft and lightly browned, about 8 minutes. Add the garlic and cook for 1 more minute.
  • In a large mixing bowl, combine the heavy cream, nutmeg, salt and pepper. Add all the butternut squash slices, 3/4 cups of gruyere cheese and leek mixture. Toss to combine, then transfer to prepared dish. Gently press down on the top of the gratin to ensure everything is laying as flat as possible.ย 
  • In a medium bowl, combine remaining gruyere cheese with breadcrumbs and pecans (if using). Evenly spread over top of squash. Dot with remaining tablespoon butter, cut into pieces.
  • Cover tightly with aluminum foil and bake for 30-40 minutes, or until squash feels tender when pierced with a fork. 
  • Remove the foil and bake until beautifully golden brown and bubbling, about 10 to 15 minutes more. 
  • Let cool for at least 15 minutes then garnish with chives, if using, before slicing and serving.
sautรฉed leeks and fennel in skillet
final layer of gratin in baking dish
scattering bread crumbs and nuts over top of partially baked gratin
gratin just out of the oven

How To Thinly Slice Butternut Squash

Butternut squash is quite easy to peel and slice. For this recipe, the butternut squash should be sliced into โ…›-inch or 1/4-inch-thick rounds. I prefer to use a sharp knife as opposed to a mandolin to slice it because most mandolins aren’t big enough.

Once peeled, start slicing the neck of the squash into thin rounds until you get to the seeds. At this point, scoop out the seeds, cut the bulb in half and slice each half into half moon slices.

slicing butternut squash on cutting board
slicing halved squash bulb

Make Ahead Instructions

Some gratins are tricky to make ahead because the vegetables on the top layer can discolour or dry out, particularly when reheated.

However, unlike potatoes, or other white root vegetables, butternut squash gratin is notorious for staying moist and will not discolour so it keeps well for days when tightly covered and stored in the refrigerator.

Just bake the gratin without the bread crumbs then cool completely to room temperature. Cover tightly and refrigerate for up to 3 days. On the day you are ready to serve it, bake the gratin, covered with foil, at 375ยฐF for 20 minutes. Remove foil, top with bread crumbs and bake for 10 to 15 minutes longer, or until gratin is golden and bubbly.

TIP: Remove the gratin dish from the refrigerator 30-60 minutes before baking. This will help it reheat faster and more evenly.

baked butternut squash gratin with small bowl of chives beside it

Expert Tips

Don’t soak the sliced squash in water. Some recipes call for soaking sliced butternut squash in water top remove the starch. This is not necessary and even a bit of extra moisture can make the gratin unpleasantly watery. In addition, here the starches from the squash are essential to help thicken the cream.

Don’t use half and half or milk. You need heavy cream for this gratin. Anything with less fat content will curdle and will not thicken properly.

Adjust the amount of squash accordingly. The size and shape of your baking dish will affect the amount of squash you can fit. Buy an extra squash in case you need to fit more and add a tad more cream to the mix.

Season generously. Butternut squash can taste bland if not seasoned enough. If the finished dish tastes a little flat, season with a little more salt and pepper to taste.

Cover with foil for part of the cooking. The butternut squash will cook quicker and more evenly if covered during some of the cooking time.

Freeze any extra butternut squash. My butternut squash was not very big but I had a bit leftover from the second one. If you have any leftover squash, cut it into chunks and freeze for up to 3 months. It will be great to add to soups or stews.

butternut squash gratin served on small plate

Storing Tips

Leftovers of this butternut squash gratin are delicious the next day. In fact, as I am writing this post, I am enjoying a rather hefty portion of leftovers for lunch and it is absolutely scrumptious.

  • To Store. Place cooked and cooled leftovers in an airtight storage container in the refrigerator for up to 4 days.
  • To Reheat. Gently reheat leftovers in a baking dish covered with foil in the oven at 350ยบF until warmed through. You may need to add a few splashes of cream if it seems really dry (mine usually isn’t).

What To Serve With Butternut Squash Gratin

This squash gratin is the perfect Thanksgiving or holiday meal side dish. It pairs beautifully with this spatchcocked turkey or with a rib roast. We also love it with a roasted chicken, or a simple pork roast.

It would also make a great vegetarian main alongside a salad or other vegetables such as roasted broccoli or cauliflower.

More Thanksgiving Recipes To Try

  • Honeynut Squash with Brown Butter
  • Potato Au Gratin with Caramelized Onion
  • Red Wine Cranberry Sauce
  • Slow Cooker Turkey Breast
  • Chicken Pot Pie
Print Recipe Pin Recipe

Butternut Squash Gratin

Author: Sandra Valvassori
Everyone is sure to love this savoury-sweet Butternut Squash Gratin that screams Thanksgiving and Christmas. Oozing with creamy cheese and a crunchy bread crumb topping, I guarantee it will be the hit at your holiday table or any special occasion meal.ย 
Prep Time 25 minutes mins
Cook Time 45 minutes mins
Total Time 1 hour hr 10 minutes mins
Servings 8
Close-up of spoon scooping out a piece of butternut squash gratin from baking dish

Ingredients  

  • 3 tablespoons butter, divided (or use all oil if you prefer)
  • 3 tablespoons Olive oil, divided
  • 2 large leeks, white and light green parts, cleaned of all dirt thinly sliced
  • 1 small fennel bulb, stalks removed, halved and cored, and sliced 1/4-inch thick (optional)
  • Kosher salt and freshly ground black pepper
  • 2 cloves garlic minced
  • 1 cup heavy cream
  • 1/2 teaspoon nutmeg
  • 2 1/2 pounds butternut squashย peeled, and thinly sliced (about 1/8 – inch thick) *see photos in post for guidance
  • 1 cup grated gruyere cheese, divided (about 3 ounces)
  • 2 cups coarse fresh breadcrumbs or panko
  • 1/4 cup parmesan cheese
  • 1/3 cup pecans (optional)
  • 2 tablespoons chopped chives, optional for garnish

Instructions 

  • Preheat the oven to 375ยบF. Grease a 8-ยฝ ร— 11-ยฝ-inch oval, or rectangular, shallow baking dish with 1 tablespoon butter (or oil).ย 
  • Heat 1 tablespoon butter and 1 tablespoon olive oil in a large skillet over medium heat. Sautรฉ the leeks and fennel (if using), season with 1 teaspoon salt and a few pinches of black pepper, tossing occasionally, until soft and lightly browned, about 8 minutes. Add the garlic and cook for 1 more minute.
  • In a large mixing bowl, combine the heavy cream, nutmeg, 1/4 teaspoon salt and 1/4 teaspoon pepper. Add all the butternut squash slices, 3/4 cups of gruyere cheese and leek mixture. Toss to combine, then transfer to prepared dish. Gently press down on the top of the gratin to ensure everything is laying as flat as possible.
  • In a medium bowl, combine remaining 1/4 cup gruyere cheese, breadcrumbs, parmesan cheese, and pecans (if using). Evenly spread over top of squash. Dot with remaining tablespoon butter, cut into pieces.
  • Cover tightly with aluminum foil and bake for 30-40 minutes, or until squash feels tender when pierced with a fork.
  • Remove the foil and bake until beautifully golden brown and bubbling, about 10 to 15 minutes more.
  • Let cool for at least 15 minutes then garnish with chives, if using, before slicing and serving.

Notes

  • To Store.ย Place cooked and cooled leftovers in an airtight storage container in the refrigerator for up to 4 days.
  • To Reheat. Gently reheat leftovers in a baking dish covered with foil in the oven at 350ยบF until warmed through. You may need to add a few splashes of cream if it seems really dry (mine usually isn’t).
Keywords: Gratin recipe, Butternut squash gratin recipe, easy butternut squash gratin
Tried this recipe?Tag @sandra_valvassori on Instagram or hashtag #sandravalvassori!

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