Sweet potato gratin is a rich, comforting dish that brings together thinly sliced sweet potatoes layered with a creamy, cheesy sauce. Baked until golden and bubbling, this gratin is a delightful balance of sweet, savory, and creamy flavors that makes it perfect for holidays, dinner parties, or a cozy weeknight meal.
The natural sweetness of the sweet potatoes pairs beautifully with the richness of the cream and the salty, nutty flavor of melted cheese. The dish typically starts with thinly sliced sweet potatoes arranged in overlapping layers in a baking dish. Each layer is seasoned with salt, pepper, garlic, and sometimes a touch of thyme or rosemary for an earthy note.
The sauce is made from heavy cream or half-and-half, often infused with garlic and herbs to give it extra flavor. As it bakes, the cream thickens and combines with the starch from the potatoes to create a luscious, velvety texture. A generous sprinkling of cheese like Gruyère, Parmesan, or sharp cheddar melts into the layers and forms a crispy, golden crust on top.
Some versions add a pinch of nutmeg or a bit of Dijon mustard to balance the sweetness and add depth. You can also customize it by mixing in caramelized onions, spinach, or crumbled bacon for extra flavor.
Sweet potato gratin pairs beautifully with roasted meats like chicken, pork, or beef but is equally satisfying as a main dish with a crisp green salad on the side. It also works wonderfully on a holiday table alongside turkey or ham.
For drinks, a glass of Chardonnay, a light red like Pinot Noir, or even sparkling water with lemon complements the richness of the gratin perfectly.
With its creamy layers, crisp cheesy top, and beautiful orange color, sweet potato gratin is a dish that feels both rustic and elegant. It is a true crowd-pleaser that brings warmth and comfort to any meal.
Ingredients
- 2 pounds sweet potatoes peeled and thinly sliced
- 1 cup heavy cream
- 1 cup gruyere cheese shredded
- 2 cloves garlic minced
- 1 teaspoon salt
- 1/2 teaspoon black pepper
Instructions
- Preheat the oven to 375°F (190°C).
- In a saucepan, heat the heavy cream, garlic, salt, and pepper over medium heat until it starts to simmer. Remove from heat.
- Layer half of the sweet potatoes in a greased baking dish. Pour half of the cream mixture over the potatoes and sprinkle with half of the cheese.
- Repeat the layers with remaining sweet potatoes, cream mixture, and cheese.
- Cover with aluminum foil and bake in the preheated oven for 40 minutes.
- Remove the foil and bake for an additional 20 minutes, or until the top is golden brown and the potatoes are tender.
- Allow to cool slightly before serving.
Nutrition
This was a really good dish! The creamy texture and the cheese were just perfect together. I didn’t have Gruyere, so I used cheddar and it still turned out great! Yum!
I’m so glad you liked it! Cheddar is a great substitution for Gruyere, I might try that next time too!
I dunno, using cheddar instead of Gruyere seems kinda risky. But hey, if you liked it, more power to ya!
I’m skeptical about using that much cream for something so simple, but wow it works. The texture is rich and comforting. Great recipe!
Cream makes it good, but I worry it’ll be too heavy. Still, I guess 40+20 mins does the trick. Might cut the cream next time? 🤔
I was the same—seems like a lot of cream for sweet potatoes. But the richness is real, and the garlic flavor comes through. Glad it worked for you!
Such a simple recipe and it came out great. Thanks a lot!
It is just ok… Nothing special. Maybe I expected too much.
This recipe is amazing! The combination of sweet potatoes and gruyere is to die for. My family loved it!
Why sweet potatoes? Can’t you just use regular ones? Guessing it tastes fine tho.
I think sweet potatoes are way tastier! They add a nice sweetness that regular ones just don’t have. Try it, you might be surprised!
Why not just use normal potatos? Sounds like a gimmick to me. But who knows…
One word: amazing.
Sounds good, but 40 min + 20 seems like a lot—are the slices thin enough? Mine would still be firm at that temp.
Right?! The creamy garlic sauce + golden top is perfection.
Loved it. I used fresh gruyere and it tasted fancy without being too hard. Next time I’ll slice the sweet potatoes even thinner so they cook more evenly.
Glad you liked it! Fresh gruyère is such a good call—totally makes it feel “fancy” 😄 And yeah, slicing thinner will help with more even tenderness. I’m gonna try that next time too.
Sweet potatoes?! Who eats that? I don’t like the taste at all. Didn’t work for me.
I actually love sweet potatoes! They have such a nice flavor when baked like this. Maybe try adding more spices next time?
Why cream *and* cheese? It’s like eating a rich hug, but yeah… portion control was not happening 😂
This gratin is a game changer! Perfect for Thanksgiving!
I can’t wait to try this for Thanksgiving! It sounds so good, YUM!
Game changer? Really? I don’t know if I believe that. How can sweet potatoes beat turkey?
This feels a little fancy for me. I don’t always have gruyere so I swapped in cheddar—still good, just less “nutty” if that makes sense.
Loved it! So tasty. Definitely making again! ⭐️⭐️⭐️⭐️⭐️
Yummm!!! 10/10, will cook again!
This gratin is to die for! So creamy and cheesy, my family loved it!
I’m so glad your family enjoyed it! We loved it too, it’s become a staple at our dinners!
Omg, soooo good! I’ve never used gruyere before but it made a huge difference. Definitely making it again!
Leftovers? What leftovers? Gone in a flash!
Honestly I was skeptical about the thin-slice thing, but it cooked through nicely. Next time I’ll grate the cheese a bit finer so it melts more evenly.
Perfect side dish for Thanksgiving! Everyone had seconds. I used nutmeg too, added a nice touch.
Sounds delicious! I’ll have to try adding nutmeg next time. Glad it was a hit!
Thanksgiving? More like every day side dish! But I thought gratin was just potatoes and cheese?
Made this for dinner last night—super cozy and the garlic cream really soaks in. I used an extra pinch of pepper and it came out perfect.
Absolutely delish! My fam loved it!
I dunno, it seems kinda rich with all that cream. Isn’t it gonna be too fatty for kids?
So glad to hear that! This dish is a hit with my family too. It’s always a crowd-pleaser!
Took me a while to make but well worth it! It was a hit at the party I brought it to.
How do you grate cheese? I just bought pre shredded. Is that ok?
Too much cheese, I think. My heart does not approve.
I tried this but it was way too creamy for my taste. Is 1 cup really necessary?
I understand what you mean! I think you could try using less cream or maybe substitute with some vegetable broth for a lighter version.
I love creamy dishes! But yeah, if you’re not a fan, maybe just use half a cup next time.
The gratin took forever to cook! About 80 minutes instead of 60. Anyone else have that problem?
I don’t get it. How could it take longer? The recipe says 60 minutes!
Yeah, mine took way longer too! I thought I was just doing something wrong.
This is the perfect comfort food! Loved it so much, my family asked for seconds.
Yum! But I’m not a fan of gruyere cheese, I swapped it with cheddar. Still turned out great!
I used pre-shredded cheese and it clumped a bit. Probably better to shred fresh. Tasted great, texture was just meh.
Mine does that too 😅 I always just toss it in and hope. Maybe I should thin slice the spuds more? I used the fancy bags and it was clumpy. Still ate it, but texture was kinda sad.
Good call on shredding fresh. Pre-shredded cheese usually has anti-caking stuff, so it doesn’t melt as smoothly—clumps make sense. Glad it still tasted great though!
Not the best. Mine turned out mushy. Please make sure to slice them really thin!
Seems easy n all, but why do you cover it with foil? Isn’t that gonna make it soggy?
I found it a bit too creamy for my taste. Maybe less cream next time?
Easy peasy! A bit too much garlic for my liking, but overall very tasty.
Delicious! This is the best recipe I’ve ever tried! Super creamy and cheesy.
I followed the recipe but it came out too soggy. Did I do something wrong?
I found this recipe a bit too rich with all the cream and cheese. Maybe less cheese next time.
I added some onions for extra flavor! 👌
Onions?! That’s a bold move. I usually stick to the basics. Hope it turns out good!
What temp is 375 in celsius? Can someone help me out?
Why do people even ask this? Just look it up on the internet! But yeah, it’s about 190°C.
375°F is around 190°C. You’re good to go!
Sweet potatoes are not for me, but my family loved this! They devoured it!
I dunno, but sweet potatoes are too mushy sometimes. My kids won’t eat it if it’s soft like that.
Glad to hear your family enjoyed it! Sweet potatoes can be hit or miss for some, but it sounds like a win! 🍽️
Too much cream. It was swimming in sauce! Maybe cut down on the cream next time.
I didn’t have gruyere, so I used cheddar. It still tasted good, but it wasn’t the same—more sharp. If you can, stick with gruyere for that nutty vibe.
Good to know! I bet cheddar would make it more tangy/sharp compared to gruyère’s nuttier flavor. I’ll try to swap wisely next time—maybe even mix cheddar with a little parmesan?
How can you call this gratin without adding breadcrumbs on top? #DISAPPOINTED
I totally get what you mean! A nice crunchy breadcrumb topping would have been perfect. Maybe next time I’ll add it myself.
Breadcrumbs aren’t traditional in all gratin dishes tho. It might still taste great without them.
Sweet potatoes are not meant to be cooked this way. I think normal potatoes would work better. Never again.
I love sweet potatoes! This recipe is unique and sounds delicious to me. Give it a try!
Honestly, I baked mine and the potatoes weren’t tender after 60 minutes. I ended up adding like 15 more. Not sure if my slices were too thick or my oven runs hot.
Yeah, 60 minutes can be optimistic. If you cover with foil the first part helps, but if your oven runs hot/cold or your slices are uneven, they won’t soften. Also, make sure you’re greasing the dish well so the cream cooks into everything.
Mine usually take a full 60–70 minutes total at 375°F, especially if the slices are thick. Next time I’d go thinner *and* check with a fork around the 45–50 minute mark (even before taking the foil off).
Easy steps, but cutting 2 pounds of sweet potatoes that thin is a workout 😂. I’m lazy so mine were a bit uneven. Despite that, it turned out flavorful.
Right?! Those slices are no joke 😂—I always end up with “rustic” thickness too. Still, the cream + garlic does the heavy lifting. I love that yours stayed flavorful even if uneven.
Sweet potato wut?? I’m stickin’ to my white potatoes!
Not bad, but mine was watery near the edges. I think I didn’t simmer the cream long enough before layering. Still tasty though—just not as thick as I hoped.
Did I miss it or was there no sage? I often add that to my dishes for flavor!
I think sage would be great in this! It adds a nice earthy flavor. 😍
Kinda bland for me—could use more salt or maybe a dash of nutmeg. I know it says salt/pepper only, but I like more depth.
Too salty for me. I’m probably sensitive to salt though. The cheese is doing most of the heavy lifting, so next time I’ll reduce the salt or use less gruyere.
So easy to make! My kids helped me out, and I was pleasantly surprised they liked it.
So good! I let it cool longer than “slightly” and it set up better. Everyone went back for seconds.
Pretty good, but I felt like it needed a bit more seasoning—maybe another pinch of salt. Also my top browned a little too fast at 375°F, so I’d keep an eye on it.
Honestly, I’m not a cook but this was pretty simple to follow, thumbs up!
The flavor is great, but mine took closer to 1 hour total to get fully tender (oven runs hot/cuts corners). Still delicious though!
Yuk, I used regular potatoes instead of sweet and it didn’t work out. Must try it with sweet potatoes!
But can’t you just use any potato? I dunno, that seems like an unnecessary step. Just go with what you have!
Definitely try it with sweet potatoes! They add such a nice flavor. Regular potatoes just don’t cut it in this dish.
I followed the recipe exactly and my top never got properly golden—more like light brown. Not sure if foil trapped moisture or my oven is weird.
I don’t know… I feel like it needs more seasoning or something. It was kinda bland for me.
OMG yum! I added nutmeg like my grandma did! Perfect! 💖
This came out super creamy and the garlic flavor really shines. I covered it for the first part like the instructions said and it browned perfectly after. Will make again for holidays!
Yes! Mine came out exactly like this too—so creamy and the garlic is front and center. I like that you browned it after covering the whole time.
I tried this but mine never got brown even after removing the foil… maybe my oven runs cold? Also I used way more garlic than 2 cloves and it tasted kinda sharp, but still good.