Cheesy Scalloped Sweet Potatoes - Easy Sweet Potato Au Gratin Recipe! (2024)

These Cheesy Scalloped Sweet Potatoes are a fun twist on the classic sweet potato side dish. This easy casserole is just as good as your traditional sweet potatoes topped with marshmallows!

For another tasty sweet potato side dish, try my healthy grilled sweet potato salad! Or, try these easy cheesy scalloped potatoes with regular potatoes.

Table of Contents

• Cheesy Scalloped Sweet Potatoes Recipe
• Why You’ll Love This Sweet Potato Gratin
• What You’ll Need
• How to Make Scalloped Sweet Potatoes
• Can I Make This Ahead?
• Serving Suggestions
• How to Store Leftovers
• More Potato Recipes
• Get the Recipe

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Cheesy Scalloped Sweet Potatoes Recipe

Sweet potatoes have been one of the “go-to” side dishes at our holiday meals for a long time. My mom used to make THE BEST sweet potato casserole around. Her’s leaned more towards the sweet side of things, as it was made with brown sugar, vanilla extract, cinnamon, and then a crunchy pecan crumble topping that my dad and I would fight over.

Today’s recipe, though, is a masterpiece of savory flavors. These cheesy scalloped sweet potatoes may not be topped with marshmallows, but they’ll still be a huge hit!

When I was dreaming up this recipe I knew the herbs I wanted to use were thyme and tarragon. The main reason I chose those herbs is because the citrus herb mixture I slather my turkey with includes sage, tarragon, rosemary, and thyme. I wanted to carry those flavors throughout the entire menu so that every dish flows into the next. In my opinion, when everything works together, that’s how you know you have an incredible meal!

Why You’ll Love This Sweet Potato Gratin

This recipe is sort of a mix of sweet potato gratin and scalloped potatoes – you’ll love it! Here are a few reasons why:

• Super flavorful. The sweetness from the sweet potatoes combined with the fresh lemony herbs and buttery gruyere cheese that is just slightly browned is mouth-wateringly good! Your family will not be able to get enough of this dish.
• Perfect for any occasion. These sweet potatoes are awesome at a holiday meal, but they’ll also work with your favorite steak dinner, or you could make them just because as a comfort food dish.
• Easy. This sweet potato gratin recipe requires just 10 minutes of prep work, and then all you have to do is pop the potatoes into the oven and wait for them to be done.

What You’ll Need

Let’s talk ingredients! Here’s what you’ll need to round up to make this dish happen. If you’re looking for exact amounts or the full set of directions, check out the recipe card below!

• Sweet potatoes – Cut these into 1/3” slices before you begin.
• Butter – You can use salted or unsalted butter, whichever you prefer. If you use salted, you may want to omit the additional sea salt.
• Shallot – If you would rather use an onion, feel free!
• Garlic – Freshly minced garlic cloves are the way to go.
• Heavy cream – This will make your casserole extra creamy and thick.
• Milk – I like to use 2% milk in this recipe, in addition to the heavy cream.
• Seasoning – Add in a mix of diced fresh thyme, diced fresh tarragon, and sea salt.
• Cheese – Shredded gruyere cheese really ties this dish together!

How to Make Scalloped Sweet Potatoes

This scalloped sweet potato gratin recipe is made in just a few simple steps. Here’s how it all comes together:

• Preheat the oven to 400 degrees. Spray the bottom of a 13×9″ baking dish with cooking spray, then set it aside.
• Slice the potatoes. Using a mandoline, slice the sweet potatoes to 1/3″ thick. (If you do not have a mandoline, use a very sharp knife.)
• Start the first layer. Add half of the sweet potatoes to the greased baking dish.
• In the meantime, heat a small sauce pan to medium high heat. Place the butter and shallots in the pan and saute them until translucent (about 3-4 minutes). Next, add in the garlic and saute it for 30 seconds. Then, add in the heavy cream, milk, fresh thyme, fresh tarragon, and sea salt, and stir. Bring everything to a boil and then remove the pan from the heat.
• Pour half the milk mixture over the sweet potatoes. After that, top your casserole with half of the gruyere cheese. Finally, add another layer of the remaining sweet potatoes, and top those with the remaining milk mixture and cheese.
• Cover the casserole with tin foil and bake for 30 minutes. Then, remove the tin foil and bake for an additional 25-30 minutes, or until the sweet potatoes are tender.

Can I Make This Ahead?

Yes! Meal prep during the holidays can be stressful, so you can definitely make this recipe ahead of time if you want to free up some oven space for day-of preparations. Simply prepare and bake the casserole, store it for up to 2-3 days in the fridge as directed in the “how to store” section below, and reheat it in the oven until warmed through when you’re ready to enjoy it.

Tips & Recipe Variations

As you can see, this recipe is pretty straightforward. I do, however, still have some tips for you to make the process even easier!

• Test for doneness. Make sure the potatoes are tender in the centers (as well as on the edges) before you pull the baking dish out of the oven. Depending on how thick you slice the potatoes, they may need a little more time in the oven!
• Make sure to slice the potatoes to an even thickness. This way, everything will cook evenly. Using a mandoline is the best way to ensure a uniform thickness, but a sharp knife will work as well.
• Swap in another kind of cheese. I love gruyere in this recipe, but mozzarella, for example, is great too! You could also mix the two together, if you like.
• Add bacon. Some bacon bits on top of these cheesy potatoes would taste fantastic!

Serving Suggestions

There are so many things that you can serve with this sweet potato au gratin recipe! Here are a few of my favorite choices:

• Turkey: If you’re making these potatoes for Thanksgiving, try pairing them with this easy, no-fuss whole turkey recipe or this garlic herb oven roasted turkey breast.
• Chicken: I highly recommend trying this perfect roasted chicken!
• Steak: Serve these potatoes with something like this grilled ribeye steak – it’s hard to beat the classic steak and potatoes combo!

How to Store Leftovers

Scalloped sweet potatoes are so creamy and delicious that you probably won’t have any leftovers… but if you do, here’s how to save them for later!

• To store. You can keep sweet potato gratin in an airtight container in the fridge for 3-4 days. I don’t recommend trying to freeze it, as the texture of the potatoes will not hold up.
• To reheat. If you don’t really mind a slight change in texture, simply use the microwave. Or, preheat the oven to about 350 degrees, and bake the casserole until it is warmed through.

More Potato Recipes

If you enjoyed these cheesy scalloped sweet potatoes, be sure to give these other easy potato side dishes a look, too!

• Garlic Ranch Potatoes
• The Best Air Fryer Roasted Potatoes
• Garlic Herb Hasselback Potatoes
• Sweet Potato Casserole With Pecan Streusel

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