These cheesy scalloped sweet potatoes are the ULTIMATE comfort food side dish. Gruyère, Parmesan, cream, garlic, and seasonal spices bake to melty perfection. No one will be able to resist this side dish.
This sweet potato gratin recipe is everything a gratin/scalloped potatoes should be. We've got our cheeses. We've got our cream. We've got garlic. We let it bake for long enough for the sweet potatoes to soften, everything to beautifully meld together, and for the cheese to bubble up all golden brown and delicious.
I had to restrain myself from eating way more of this than I should have. 'Nuff said about that.
This sweet potato side dish would be great for any cold day, a Thanksgiving side dish, a Christmas side dish... or whenever you want some cheesy comfort food, honestly.
How to make scalloped sweet potatoes (summary):
Using a mandoline slicer, cut the sweet potatoes into 1/8" thick slices. Grate the cheeses, add them to a bowl, and toss with your hands to mix them together. To a saucepan, add the cream, salt & pepper, garlic, cinnamon, nutmeg, and Italian seasoning over high heat. Remove it from the heat just as it comes to a boil. Arrange a layer of sweet potatoes on the bottom of a 10" skillet (or a baking dish), then spoon on some of the cream mixture and then a layer of the cheese mixture. Repeat until you've built 4 layers. Bake for 60-75 minutes or until the potatoes are cooked through, then let it sit for 10 minutes prior to serving. (Full ingredients & instructions are in the recipe card below)
Recipe notes & tips:
- Use a mandoline to slice the sweet potatoes thin and evenly (1/8" thick). I don't know what I would do without this little device. I use a protective glove too for peace of mind.
- You don't need to make these in a cast iron pan like I did, but just make sure that you leave an inch or so from the top of the pan/baking dish because the cream and cheese will bubble, and cleaning that stuff out of the inside of your oven ain't fun. I was able to do 4 layers in my 10 1/4" Lodge skillet. Place the skillet on a baking sheet for added spill protection in your oven if you wish.
- Don't be tempted to skip heating the cream mixture. I heat it for a couple of reasons 1) the spices don't dissolve properly in the cream when it's cold and 2) Heating it helps infuse the spices and garlic in the cream so you've got a more uniform taste.
- You want around 2 pounds of sweet potatoes for this dish. That's 2 medium-to-large sweet potatoes. I normally don't weigh stuff, but you may end up with too much or too little, so that's what those grocery store scales are for. Sweet potatoes get pretty massive, so what does "medium" even mean? Weigh 'em.
- Some of my sweet potato slices ended up being pretty huge, but that's ok. As long as you arrange them in an even layer (some overlap is fine!), it doesn't matter if the slices aren't all the same size (but the same thickness is important).
More sweet potato recipes to try:
- Creamy Sweet Potato Soup
- Rosemary & Sage Mashed Sweet Potatoes
- Sausage and Sweet Potato Soup
- Turkey Sweet Potato Chili
Hope you love this recipe as much as I did!
Questions? Ask me in the comments below!
Cheesy Scalloped Sweet Potatoes
- 2 pounds sweet potatoes (I used 2 medium-to-large sweet potatoes) peeled & sliced 1/8" thick
- 1 cup freshly grated Gruyère cheese
- 1 cup freshly grated parmesan cheese
- 2 cups heavy/whipping cream
- Salt & pepper to taste
- 4 cloves garlic minced
- 1/8 teaspoon ground cinnamon
- 1/8 teaspoon ground nutmeg
- 4 dashes Italian seasoning
- Olive oil for greasing the pan
- Preheat oven to 350F and move the rack to the middle position.
- Peel your sweet potatoes. Using a mandoline slicer, slice your sweet potatoes 1/8" thick.
- Grate your cheeses. Add them to a bowl and toss them so they're mixed.
- Add the cream, salt & pepper (I'm pretty generous), garlic, cinnamon, nutmeg, and Italian seasoning to a small pan on high heat. Watch it closely and remove it from the heat just before it begins to boil.
- Grease a heavy, oven-proof skillet or a large baking dish with olive oil.
- Arrange a layer of sweet potatoes on the bottom of the skillet, then spoon on some of the cream mixture and then a layer of the cheese mixture. We're making 4 layers, so you will want to use about 1/4 of everything for each layer. I overlap the sweet potatoes a bit in each layer. Tip: make sure you've got about an inch or so left at the top of the skillet/baking dish when you're done your last layer. The cream and cheese will bubble all over the oven otherwise.
- Bake for 60-75 minutes (will vary depending on your pan/baking dish). I wanted a dark golden cheese layer and the cream to be nicely thickened up, so I went for the full 75 minutes. A toothpick should slide in with no resistance. Let the gratin sit for about 10 minutes prior to serving. Enjoy!!
- This is the mandoline slicer I used to make this recipe. I suggest using a protective glove like this one to safely use a mandoline.
- This is the Lodge cast iron skillet I used for this recipe.
- I put some success tips in the blog post, so I suggest looking those over prior to making this recipe.
- Serves 4+