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If you are looking for a holiday side that steals the show, look no further! My Easy Butternut Squash Gratin is your new best friend. This dish is creamy, savory, a little sweet thanks to the squash, and absolutely beautiful on a Thanksgiving or Christmas table. The best part is that it looks like you put in a ton of effort when in reality, you sliced, mixed, and let the oven take over. As a busy mom of two who loves a shortcut that still feels elevated, this gratin checks every single box.
My Easy Butternut Squash Gratin is a gluten-free holiday side that brings together tender butternut squash, mellow buttery leeks, fresh herbs, a hint of nutmeg, and a golden blanket of melted Gruyere. It is simple to prepare, it can be assembled in advance, and it pairs beautifully with turkey, ham, beef tenderloin, or whatever main you serve during the holidays.
❤️ Why You’ll Love My Easy Butternut Squash Gratin
You will love my Easy Butternut Squash Gratin for the same reasons my family devours it every year. It feels rich without being heavy, it works for gluten-free guests, and the flavors are festive and cozy. The leeks melt into the squash, the herbs make your kitchen smell like fall, and the Gruyère gives you that irresistible nutty crust. It is a side dish that always gets recipe requests and usually disappears immediately!
🍲 Ingredients
This Easy Butternut Squash Gratin uses simple ingredients that marry into the most delicious savory holiday side. The key is fresh herbs, buttery leeks, sweet squash, and a generous snowfall of nutty cheese.
🥘 One large butternut squash creates the hearty, tender base of the gratin.
🧅 Fresh leeks bring mild sweetness that melts into the squash as it bakes.
🧈 Unsalted butter adds richness and helps the herbs bloom.
🌿 Fresh rosemary and fresh thyme give the dish its signature earthy holiday aroma.
✨ Nutmeg adds a warm hint of spice that works beautifully with squash.
🧂 Kosher salt and black pepper bring balance and highlight the natural sweetness of the squash.
🥛 Heavy cream creates the velvety sauce that keeps every bite tender.
🧀 Gruyere cheese forms a bubbly, golden, nutty crust that makes this dish unforgettable.
🌱 Fresh parsley brightens the final dish and adds color for serving.
👩🍳 How to Make My Easy Butternut Squash Gratin
Start by preheating your oven to 400°F.
Slice your squash in half, scrape out the seeds, peel it, and cut the squash into quarter-inch thick half moons.
Butter a 13 x 9 casserole dish and toss in the squash slices and thinly sliced leeks. Mix the herbs, nutmeg, salt, and pepper in a small bowl. Drizzle the melted butter over the squash, sprinkle the seasoning on top, and use your hands to mix everything together. Pour the cream over the veggies, cover with foil, and bake for thirty minutes.
Remove the foil and bake for ten more minutes. Add the shredded Gruyère and bake again until the cheese melts and turns beautifully golden, about ten to fifteen minutes.
Finish with fresh parsley and serve warm.
🪄 Tips and Tricks
- To properly clean the leeks, slice them first, then soak them in a bowl of cold water, let the sand sink, scoop up the leeks.
- If you want to prep ahead, assemble the entire gratin without baking, cover it tightly, and refrigerate for up to twenty-four hours.
- If you want an extra crispy cheesy top, broil the gratin for one minute at the end but watch it closely.
- If your squash is very large, do not overcrowd the baking dish. Use two smaller dishes to ensure everything cooks evenly.
🗒 Variations
- Try swapping Gruyere for a blend of fontina and parmesan for a slightly sharper flavor.
- Add crispy pancetta or bacon to give the gratin a smoky, savory twist.
- Use sage instead of rosemary for a deeper fall flavor profile.
🗒 Substitutions
- Use sweet potatoes in place of squash if you want something earthier.
- Use shallots instead of leeks if that is what you have on hand.
- Use half and half instead of heavy cream if you prefer something lighter.
- Use mozzarella for a mild, stretchy top if Gruyere is not your thing.
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👝 How to Store Leftovers
Store leftovers in an airtight container in the refrigerator for up to four days. The gratin reheats beautifully in the oven at 350 degrees until warmed through.
🤔 Common Questions
Can I peel the squash in advance?
Yes. Peel and slice it up to twenty-four hours before assembling. Keep it refrigerated in an airtight container.
Can I freeze the gratin?
Yes. Freeze it before baking for best results. Thaw overnight and bake as instructed.
Can I make this without dairy?
Yes. Use coconut milk in place of cream and use a dairy free cheese alternative.
Easy Butternut Squash Gratin
Ingredients
- 1 large butternut squash, peeled
- 2 leeks, sliced thin, rinsed well
- 3 tbsp unsalted butter, melted + more for greasing
- 1 tsp fresh rosemary, minced
- 2 tsp fresh thyme, minced
- ½ tsp nutmeg
- 1½ tsp salt
- pepper to taste
- 1 cup heavy cream
- 3 cups Gruyere, shredded
- 2 tbsps fresh chopped parsley
Instructions
- Preheat the oven to 400°F
- Slice the squash in half lengthwise, deseed, and use a potato peeler to remove the skin.
- Slice each squash half into ¼-inch thick half moons.
- Grease a 13×9 casserole dish with butter. Add all the squash slices and leeks to the baking dish.
- Add the rosemary, thyme, nutmeg, salt, and pepper to a small bowl and mix well.
- Pour the melted butter over the squash and leeks. Sprinkle the seasoning over the veggies and use your hands to mix well.
- Pour the cream over the veggies and cover with foil. Bake for 30 minutes covered, then 10 minutes uncovered.
- Top with gruyere cheese and bake until the cheese has melted and is golden brown, about 10-15 minutes.
- Garnish with parsley and serve warm
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
I’d love your stuffing Recipe!