For those who might not always gravitate towards green beans or Brussels sprouts, there’s a secret weapon in the world of vegetables that almost everyone adores: the sweet potato. While my palate might be particular about some veggies, my affection for sweet potatoes knows no bounds. Whether they are simply baked, perfectly roasted, or mashed into a creamy delight, I’m always eager to enjoy them. However, one common holiday preparation has always been an exception: those overly sweet, candied sweet potato casseroles often topped with toasted marshmallows. While a beloved Thanksgiving tradition for many, it never quite hit the mark for me.
Last year, as I embarked on a mission to refresh our holiday menu with more sophisticated and less saccharine alternatives, I sought out innovative ways to feature sweet potatoes. My quest led me to test-drive a couple of promising recipes. One was the decadent Mashed Sweet Potato Brulee, which quickly became a cherished addition. The other was this magnificent Sweet Potato Gratin with Gruyere. Imagine the classic comfort of scalloped potatoes, but elevated with the natural sweetness and vibrant color of sweet potatoes, and generously infused with the nutty, complex flavors of Gruyère cheese. This combination, I quickly discovered, is truly irresistible and has the power to win over even the most discerning diners.
Unlocking the Gratin’s Potential: The Art of Slicing
The foundation of any exceptional gratin lies in perfectly uniform slices. Achieving this consistent thickness is crucial, as it ensures that every sweet potato slice cooks evenly, resulting in a tender, melt-in-your-mouth texture throughout the dish. For tasks like this, my trusty mandoline is an invaluable kitchen tool. It makes quick work of slicing, producing impeccably even 1/8-inch thick rounds with minimal effort. If you don’t already own one, I wholeheartedly recommend investing in a good quality mandoline – it’s a game-changer for many recipes beyond gratins. The OXO Good Grips V-Blade version is an excellent and affordable option, typically around $40, and well worth the investment for its precision and safety features.
For those without a mandoline, don’t despair! A sharp chef’s knife and a steady hand can certainly achieve similar results. The key is to take your time and aim for consistency. The thinner and more uniform your slices, the more beautiful and perfectly cooked your gratin will be.
Building Flavor: Layers of Sweetness and Savory Goodness
This Sweet Potato Gratin is a masterpiece of layered flavors and textures. The construction begins with four deliberate layers of those uniformly sliced sweet potatoes, each meticulously seasoned and cheesy. Between each layer, you’ll sprinkle a delicate balance of salt, freshly ground black pepper, and fragrant fresh thyme, allowing these simple yet powerful aromatics to infuse every bite. And of course, a generous scattering of delicious Gruyère cheese finds its way into each stratum, creating pockets of gooey, savory goodness throughout the gratin.
Once the layers are stacked high, a rich, garlic-infused cream is gently poured over the entire creation, ensuring every sweet potato slice is bathed in its luxurious embrace. The final touch? An additional blanket of Gruyère cheese on top, promising a glorious golden crust. The culmination of this careful assembly is a truly remarkable dish. The sweet potatoes emerge from the oven tender and creamy, perfectly contrasted by the subtle, earthy notes of thyme and the warming whisper of garlic. Each forkful is a celebration of balanced flavors – the natural sweetness of the potatoes beautifully complemented by the savory depth of the Gruyère. This dish was an undeniable success last year, a true “home run” that garnered rave reviews, and it’s most certainly earned its encore performance at our table this holiday season and for many years to come.
Why This Sweet Potato Gratin Deserves a Spot on Your Table
Beyond its incredible taste and appealing presentation, this Sweet Potato Gratin offers several advantages that make it a perfect choice for your next gathering, whether it’s a holiday feast or an intimate family dinner. Unlike its marshmallow-topped counterpart, this gratin emphasizes the inherent qualities of the sweet potato – its earthy sweetness and creamy texture – allowing them to shine without being overshadowed by excessive sugar. The savory profile, enhanced by the Gruyère and aromatic herbs, makes it a versatile side dish that pairs wonderfully with a wide array of main courses, from roasted turkey and ham to beef tenderloin or a simple chicken breast.
Gratins, by definition, are dishes baked in a shallow pan or dish, typically topped with a browned crust, often made of breadcrumbs or cheese. This technique ensures a delightful textural contrast: a rich, tender interior beneath a beautifully crisp and golden exterior. Our Sweet Potato Gratin expertly captures this essence, offering both comfort and elegance in every spoonful. It’s a dish that feels special enough for festive occasions but is surprisingly straightforward to prepare, especially with a few strategic make-ahead tips.
Watch How to Make Sweet Potato Gratin:
For a visual guide to perfecting this delicious side dish, you might typically find a video tutorial here demonstrating each step of the Sweet Potato Gratin preparation, from slicing the potatoes to achieving that irresistible golden-brown crust.
A Trip Down Memory Lane: Last year, this time, we were celebrating another festive dish: Fresh Green Bean Casserole.
Sweet Potato Gratin with Gruyère
12
servings
30 minutes
50 minutes
1 hour
20 minutes
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Ingredients
-
1½ cups
(357 ml) heavy cream - 2 cloves of garlic, minced
-
2 pounds
(907.18 g) sweet potatoes, peeled and sliced about 1/8-inch thick -
1½ teaspoons
(1.5 teaspoons) chopped fresh thyme -
1½ teaspoons
(1.5 teaspoons) kosher salt -
¾ teaspoon
(0.75 teaspoon) fresh ground black pepper -
2 cups
(226 g) shredded Gruyère cheese
Instructions
-
Preheat oven to 400°F (200°C). In a small pot, bring heavy cream and minced garlic to a gentle simmer. Remove from heat and set aside, stirring occasionally to prevent a skin from forming. Butter a 9×13-inch shallow casserole dish or gratin dish of similar size and set aside.
-
Build the Gratin: In the prepared buttered casserole dish, arrange one quarter of the sliced sweet potatoes in a single, slightly overlapping layer. Evenly sprinkle this layer with 1/3 of the salt, pepper, and fresh thyme, then top with approximately ½ cup of the shredded Gruyère cheese. Repeat this process with another quarter of the sliced sweet potatoes, followed by 1/3 of the seasonings and another ½ cup of shredded cheese. For the third layer, use half of the remaining sliced sweet potatoes, sprinkling the last third of the seasonings and another ½ cup of cheese (you should have about ½ cup of cheese remaining). Finally, use the rest of the sweet potatoes to create one last top layer. Stir the garlic-infused cream mixture and pour it evenly over the top of the gratin, ensuring the entire top layer of sweet potatoes is covered. Gently shake the dish to help distribute the cream. Sprinkle the remaining ½ cup of Gruyère cheese over the top.
-
Cover the dish tightly with aluminum foil and bake in the middle of the preheated oven for 30 minutes. After 30 minutes, remove the foil, move the gratin to the top third of the oven, and continue to bake, uncovered, for an additional 20 minutes or until the top is beautifully browned and the sweet potatoes are tender when pierced with a sharp knife. For an even deeper golden-brown crust, you may briefly place the gratin under the broiler for a few minutes (watch it very closely to prevent burning!). Remove from the oven and allow it to cool for at least 30 minutes before slicing and serving. This resting period helps the gratin set, making for cleaner slices and enhancing the flavors.
Notes
Storage: Leftovers can be stored in an airtight container in the refrigerator for up to 3-4 days. Reheat gently in the oven or microwave.
Calories:
259
kcal
,
Carbohydrates:
16
g
,
Protein:
8
g
,
Fat:
18
g
,
Saturated Fat:
11
g
,
Cholesterol:
64
mg
,
Sodium:
417
mg
,
Potassium:
294
mg
,
Fiber:
2
g
,
Sugar:
3
g
,
Vitamin A:
11385
IU
,
Vitamin C:
2.6
mg
,
Calcium:
266
mg
,
Iron:
0.5
mg
Did you make this recipe?
Leave a review below, then snap a picture and tag @thebrowneyedbaker on Instagram so I can see it!
Michelle Lettrich
Side Dish
American