As the leaves begin to turn and the air gets crisp, I can’t help but think of the comforting aroma of a warm kitchen. One of my favorite dishes to bring to our gathering table is Sweet Potato Gratin with Smoked Gouda and Rosemary. Imagine creamy layers of sweet potatoes, beautifully baked to perfection, with the rich, smoky notes of Gouda harmonizing with fragrant rosemary. This dish is not only a showstopper for your Thanksgiving feast, but it also offers a healthy twist on traditional gratin, making it a delectable side that everyone will want to scoop onto their plates. Plus, it’s a fantastic make-ahead option that allows you more time to enjoy the company of your loved ones. Ready to elevate your table with this savory delight? Let’s dive into the recipe and bring some warmth to your dining experience!

Why is Sweet Potato Gratin Exceptional?
Creamy Layers: Each bite melts in your mouth with a smooth, rich texture, elevating the classic gratin experience.
Savory and Sweet Balance: The natural sweetness of sweet potatoes paired with the smokiness of Gouda creates a flavor profile that intrigues and satisfies.
Perfect for Gatherings: This dish not only impresses guests but is also a delightful addition to your holiday spread, pairing beautifully with mains like a Hearty Potato Kielbasa or even a roasted turkey.
Easy Preparation: With simple steps and ingredients, this recipe allows even novice chefs to shine, making it a go-to for busy cooks.
Make-Ahead Magic: Preparing this gratin in advance gives you time to relax and enjoy the occasion, as it holds up perfectly when baked later.
Flavorful Variations: Feel free to experiment with different cheeses, like a tangy Parmigiano or sharp Cheddar, to create your personalized twist on this classic dish!
Sweet Potato Gratin Ingredients
• Use these ingredients to create a mouthwatering Sweet Potato Gratin with Smoked Gouda and Rosemary!
For the Gratin
- Sweet Potatoes – Use 3 lbs of peeled, rinsed, and thinly sliced (about ⅜” thick) for that perfect creamy texture.
- Butter – 4 tablespoons add richness and help sauté the aromatics beautifully.
- Garlic – 2 cloves, minced or pressed, bring a depth of flavor that’s essential.
- Red Onion – 1 small, finely diced for sweet undertones throughout the dish.
- All-Purpose Flour – 1 tablespoon is used to thicken the sauce, ensuring it coats the potatoes perfectly.
- Heavy Cream – A luscious base for the sauce, use 1 cup or substitute with full-fat milk if preferred.
- Half-and-Half – 1 cup enhances creaminess; whole milk can work as a substitute too.
- Fresh Rosemary – ½ tablespoon finely chopped provides aromatic flavor; fresh is recommended for best results.
- Smoked Paprika – 1 teaspoon adds that smoky essence enhancing the overall flavor.
- Ground Sage, Kosher Salt, Black Pepper, Nutmeg – Season to preference, using these spices to elevate each bite.
For the Cheese
- Asiago Cheese – ⅓ cup, grated, contributes a sharp and nutty flavor that complements the dish.
- Smoked Gouda Cheese – The star ingredient, use 1 cup, divided for creaminess and smoky depth.
- Colby Jack Cheese – 1 cup, divided, adds meltability and extra creaminess to your gratin.
This unique combination of ingredients guarantees a rich and decadent Sweet Potato Gratin with Smoked Gouda and Rosemary that will be the star of your meal!
Step‑by‑Step Instructions for Sweet Potato Gratin with Smoked Gouda and Rosemary
Step 1: Preheat the Oven
Begin by preheating your oven to 400°F (200°C). This ensures your Sweet Potato Gratin with Smoked Gouda and Rosemary bakes evenly and achieves that perfect golden crust. While the oven heats up, gather all your ingredients and equipment, including a large saucepan and a 9″x13″ baking dish.
Step 2: Sauté Aromatics
In a large saucepan, melt 4 tablespoons of butter over medium heat. Once melted, add 2 minced garlic cloves and 1 finely diced small red onion. Sauté this aromatic mixture for about 5 minutes, stirring occasionally until the onion is translucent and fragrant, creating a flavorful base for your gratin.
Step 3: Create the Sauce Base
Next, whisk in 1 tablespoon of all-purpose flour with the sautéed garlic and onion, cooking for 1 minute to remove the raw flour taste. Gradually pour in 1 cup each of heavy cream and half-and-half, continuing to whisk until the mixture thickens slightly, which should take about 3–4 minutes. You’ll want it silky and smooth before adding the seasonings.
Step 4: Season the Sauce
Once your sauce is thickened, remove it from the heat and allow it to cool slightly. Stir in ⅓ cup grated Asiago cheese, ½ tablespoon finely chopped fresh rosemary, 1 teaspoon smoked paprika, and a pinch of ground sage, kosher salt, black pepper, and nutmeg to taste. This combo will elevate the flavors, giving your Sweet Potato Gratin a delicious, savory depth.
Step 5: Prep the Sweet Potatoes
While your sauce is cooling, prepare the sweet potatoes. Peel and thinly slice 3 lbs of sweet potatoes to about ⅜” thick using a mandoline or a sharp knife. This uniformity will ensure even cooking throughout. Set aside your beautifully sliced sweet potatoes, ready to be layered.
Step 6: Assemble the Gratin
Grease the bottom and sides of your 9″x13″ baking dish with butter. Begin layering the sweet potato slices at the bottom, overlapping them slightly for a beautiful presentation. Pour half of the creamy sauce over the first layer of potatoes, ensuring they are coated evenly, and then repeat with another layer of sweet potatoes.
Step 7: Add Cheese to the Sauce
Once you have layered the sweet potatoes and sauce, incorporate half of both the smoked Gouda (1 cup, divided) and Colby Jack cheese (1 cup, divided) into the remaining sauce. Mix well until the cheeses melt into the sauce, then pour it over the layered sweet potatoes, making sure to cover them entirely.
Step 8: Final Cheese Topping
For the final touch, sprinkle the remaining smoked Gouda and Colby Jack cheese evenly over the top of the gratin. Cover the dish tightly with aluminum foil to trap the moisture and heat, which helps soften the sweet potatoes during baking.
Step 9: Bake the Gratin
Place your covered gratin in the preheated oven and bake for 45-50 minutes. You’ll know it’s ready when a knife easily pierces through the sweet potatoes. This initial baking creates a tender foundation for your creamy Sweet Potato Gratin with Smoked Gouda and Rosemary.
Step 10: Brown the Top
After 45-50 minutes, remove the foil and return the gratin to the oven. Bake uncovered for an additional 15-20 minutes until the top is golden brown and bubbly, creating a delicious crust. Keep a close eye to prevent burning; the smell will be divine as it finishes baking.
Step 11: Let it Rest
Once out of the oven, allow your Sweet Potato Gratin to rest for about 10-15 minutes before serving. This resting time helps the dish set and makes it easier to cut into perfect slices, ready to delight your guests with creamy, cheesy goodness.

What to Serve with Sweet Potato Gratin with Smoked Gouda and Rosemary
Imagine the delightful harmony of flavors as you create a memorable meal around this rich and creamy gratin.
- Roasted Chicken: Juicy, herb-marinated roasted chicken adds savory depth, perfectly balancing the gratin’s creamy sweetness.
- Garlicky Green Beans: Tender green beans sautéed with garlic provide a crisp, fresh contrast to the indulgent gratin.
- Honey-Glazed Carrots: The natural sweetness of carrots, enhanced with honey, mirrors the sweet notes of the potatoes, creating a balanced plate.
- Quinoa Salad: A light, nutty quinoa salad with fresh veggies introduces a delightful texture and adds a nutritious element to your spread.
- Cranberry Sauce: This tart and sweet sauce cuts through the richness of the gratin, adding a pop of flavor that’s perfect for special occasions.
- Red Wine: A glass of smooth red wine, like a Merlot or Pinot Noir, enhances the meal’s flavors and creates a cozy dining experience.
- Mini Pumpkin Pies: These sweet, spiced pies for dessert echo the seasonal theme and will have your guests asking for seconds.
Expert Tips for Sweet Potato Gratin
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Uniform Slicing: Use a mandoline or a sharp knife to slice the sweet potatoes evenly, ensuring even cooking throughout your Sweet Potato Gratin with Smoked Gouda and Rosemary.
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Cool the Sauce: Allow the sauce to cool slightly before mixing in the cheese. This prevents clumping and ensures a smooth, creamy texture.
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Foil Covering: Cover the gratin with foil during the first bake to trap steam, helping the sweet potatoes soften. Remove the foil later for browning.
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Cheese Options: Don’t hesitate to switch up the cheeses! Try a blend of sharp Cheddar or Fontina for a unique twist on this savory gratin.
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Resting Time: Let your gratin rest for 10-15 minutes after baking. This helps it set, making it easier to serve and enhancing the flavors.
Make Ahead Options
These Sweet Potato Gratin with Smoked Gouda and Rosemary are perfect for meal prep enthusiasts! You can slice the sweet potatoes and prepare the creamy sauce up to 24 hours in advance. Simply store the sliced potatoes submerged in cold water to prevent browning, and keep the sauce in an airtight container in the refrigerator. When you’re ready to enjoy this comforting dish, layer the potatoes in a greased baking dish, pour the prepared sauce over, and finish with cheese before baking as directed. This make-ahead strategy not only saves time but ensures your gratin will be just as delicious and creamy when baked fresh for your family gatherings!
How to Store and Freeze Sweet Potato Gratin
Fridge: Store leftovers in an airtight container in the refrigerator for up to 3 days to maintain freshness and flavor.
Freezer: For longer storage, freeze portions of Sweet Potato Gratin in airtight containers or freezer bags for up to 2 months. Thaw in the refrigerator before reheating.
Reheating: Reheat in the oven at 350°F until warmed through, about 20-30 minutes, covering with foil to prevent drying out.
Make-Ahead: Assemble the gratin a few hours in advance and refrigerate before baking. Just remember to soak the sweet potato slices in cold water if prepping early to avoid browning.
Sweet Potato Gratin with Smoked Gouda Variations
Feel free to let your culinary creativity shine and customize this dish to your taste!
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Vegan Delight: Substitute heavy cream and half-and-half with coconut cream, and use nutritional yeast instead of cheese for a creamy, cheesy flavor without dairy.
Swap in a crunchy topping made of breadcrumbs and crushed nuts to add texture and interest. -
Extra Veggie Boost: Layer in thinly sliced leeks or sautéed mushrooms between the sweet potato layers for an additional earthy flavor and depth.
These veggies not only enhance nutrition but also add delightful variations in texture! -
Herb Infusion: Replace the rosemary with fresh thyme or sage to give the gratin a different aromatic dimension.
This small adjustment can completely transform the flavor profile of your sweet potato dish! -
Spicy Kick: For those who love a bit of heat, add a pinch of red pepper flakes or chopped jalapeños to the sauce.
This twist adds a playful spicy note that complements the sweetness perfectly. -
Nutty Crust: Top the gratin with a mixture of panko breadcrumbs, crushed almonds, or pecans before the final bake for an added crunch.
The contrast between creamy and crunchy is simply irresistible! -
Creamy Blue Variation: Mix in some crumbled blue cheese alongside the other cheeses for a bold flavor twist that pairs beautifully with sweet potatoes.
It’s a surprising option that can really elevate your dish! -
Smoked Flavor Boost: Enhance the smokiness by adding a dash of liquid smoke to the sauce.
This simple addition can intensify the flavor, making it even more mouthwatering. -
Cheese Swap: If Gouda isn’t your favorite, try using Gruyère or Fontina for a different, yet equally creamy, cheese experience.
Each cheese brings its own charm and richness to the table!
Feel inspired? Mix and match these suggestions or adapt them to suit your palate! Enjoy crafting your perfect Sweet Potato Gratin with Smoked Gouda and Rosemary.

Sweet Potato Gratin with Smoked Gouda and Rosemary Recipe FAQs
How do I select ripe sweet potatoes?
Absolutely! When choosing sweet potatoes, look for ones that are firm, with smooth skin and no dark spots or blemishes. They should be heavy for their size, and avoid any that are sprouting or have soft spots.
Can I store leftover Sweet Potato Gratin?
Very! Store any leftovers in an airtight container in the refrigerator for up to 3 days. To reheat, simply pop it in the oven at 350°F for about 20-30 minutes, covering it with foil to prevent drying out. This way, you can enjoy that delicious flavor again!
How do I freeze Sweet Potato Gratin?
Of course! To freeze your Sweet Potato Gratin, allow it to cool completely, then portion into airtight containers or freezer bags. It can be stored for up to 2 months. When you’re ready to enjoy, thaw it overnight in the refrigerator and reheat it in the oven at 350°F until hot all the way through, which should take about 30 minutes.
What if my gratin isn’t browning as expected?
Don’t worry! If your Sweet Potato Gratin lacks a golden top, simply uncover it and broil it for a few minutes to achieve that lovely browning. Just keep a close eye to prevent burning—this step can create an enticing crispy crust that enhances the dish’s overall appeal!
Is this recipe suitable for those with dairy allergies?
Not quite. Since this Sweet Potato Gratin contains several types of cheese, it’s not suitable for individuals with dairy allergies. However, you could experiment with plant-based cheeses and dairy alternatives like coconut cream or almond milk for a delicious vegan version. Be sure to check the labels for any hidden allergens, and make substitutions that suit your dietary needs!
Can I make Sweet Potato Gratin ahead of time?
Absolutely! You can assemble the gratin several hours before baking. Just remember to soak the sweet potato slices in cold water to prevent browning if you prep early. Cover it tightly with foil and refrigerate until you’re ready to pop it in the oven, allowing you to enjoy more time with loved ones at dinner!
Sweet Potato Gratin with Smoked Gouda and Rosemary Recipe FAQs

Creamy Sweet Potato Gratin with Smoked Gouda and Rosemary Delight
Ingredients
Equipment
Method
- Preheat your oven to 400°F (200°C).
- Melt 4 tablespoons of butter over medium heat in a large saucepan. Add 2 minced garlic cloves and 1 finely diced red onion. Sauté for about 5 minutes.
- Whisk in 1 tablespoon of all-purpose flour with the sautéed garlic and onion. Gradually add 1 cup of heavy cream and 1 cup of half-and-half, whisking until slightly thickened.
- Remove from heat and stir in ⅓ cup grated Asiago cheese, ½ tablespoon finely chopped fresh rosemary, 1 teaspoon smoked paprika, and seasonings to taste.
- Thinly slice the sweet potatoes to about ⅜" thick and set aside.
- Grease a 9"x13" baking dish with butter and layer sweet potato slices at the bottom, pour half of the sauce over, and repeat with another layer.
- Mix half of the smoked Gouda and Colby Jack cheese into the remaining sauce, pour it over the layered potatoes.
- Top with remaining smoked Gouda and Colby Jack cheese, cover with aluminum foil and bake in the preheated oven.
- Bake covered for 45-50 minutes, then uncover and bake for an additional 15-20 minutes until golden.
- Let rest for 10-15 minutes before serving.