As I stood in my kitchen, the aroma of rosemary mingling with the richness of melted cheese filled the air, instantly transporting me to cozy holiday gatherings. This Sweet Potato Gratin with Smoked Gouda and Rosemary has become my go-to side dish, gracing our table during festive meals and family dinners alike. Not only does it bring warmth and comfort, but its creamy, savory layers of sweet potatoes combined with the smoky depth of Gouda create a sensational flavor experience. Plus, it’s a gluten-free delight that can be prepared ahead, making it a perfect option for those bustling holiday weeks. Are you ready to impress your family with a dish that’s as beautiful as it is delicious?

Why is This Gratin a Must-Try?
Indulgent, Creamy Layers: The velvety texture of this Sweet Potato Gratin, enriched by smoked Gouda and fresh rosemary, creates a delightful comfort dish that everyone will love.
Hassle-Free Preparation: You can easily prepare this during the busy holiday season, making it a time-saving choice for gatherings.
Versatile Pairing: This delectable side is perfect alongside your favorite roasted meats or even as a standout at a potluck.
Holiday Favorite: It’s sure to become a staple for Thanksgiving feasts or any family dinner craving something special.
Whether you’re also trying out a delicious Burrata Rosemary Peach or exploring the savory goodness of Salisbury Steak Potatoes, this gratin won’t disappoint!
Sweet Potato Gratin Ingredients
For the Gratin
• Sweet Potatoes – Provide a naturally sweet and hearty base; ensure uniform slices (about ⅜ inch thick) for even cooking.
• Butter – Adds richness and enhances flavor; can be substituted with olive oil for a lighter version.
• Garlic – Enhances overall flavor; fresh garlic is preferred, but garlic powder can be used in a pinch.
• Red Onion – Contributes sweetness; shallots can be used for a milder onion flavor.
• All-Purpose Flour – Thickens the sauce; use gluten-free flour as an alternative for gluten-sensitive guests.
• Heavy Cream & Half and Half – Create a rich and creamy sauce; whole milk can substitute for half and half if desired.
• Fresh Rosemary – Adds a fragrant herby note; dried rosemary can be used, but it won’t have the same freshness.
• Smoked Paprika – Introduces a smoky depth; regular paprika can replace it but will lack smokiness.
• Ground Sage – Contributes earthy flavor; thyme can be a good substitute if needed.
• Kosher Salt & Black Pepper – Essential seasonings for balance; sea salt or table salt can work as well.
• Freshly Grated Nutmeg – Adds warmth and complexity; if unavailable, pre-ground nutmeg can be used.
• Asiago Cheese – Provides sharp and nutty notes in the sauce; substitute with Parmesan if preferred.
• Smoked Gouda Cheese – Key for richness and smoked flavor; Gouda or Fontina can be swapped.
• Colby Jack Cheese – Adds melty texture; mild Cheddar can also substitute nicely.
Get ready to impress your loved ones with this Sweet Potato Gratin with Smoked Gouda and Rosemary, a delightful addition to any festive gathering!
Step‑by‑Step Instructions for Sweet Potato Gratin with Smoked Gouda and Rosemary
Step 1: Preheat and Prepare
Begin by preheating your oven to 400°F (200°C). This temperature is crucial for achieving a perfect golden-brown crust on your Sweet Potato Gratin with Smoked Gouda and Rosemary. While the oven heats, gather your ingredients and prepare a 9×13-inch baking dish by greasing it lightly with butter or cooking spray.
Step 2: Sauté Aromatics
In a large saucepan, melt 4 tablespoons of butter over medium heat. Add 3 minced cloves of garlic and 1 finely chopped red onion, sautéing until the onion is soft and translucent—about 5 minutes. The aromas will begin to fill your kitchen, setting the stage for your rich and creamy gratin.
Step 3: Make the Sauce
Sprinkle in ¼ cup of all-purpose flour, stirring continuously for about 1 minute to cook the flour slightly. Gradually whisk in 1 cup of heavy cream and 1 cup of half and half, cooking the mixture until it thickens slightly—around 3 to 4 minutes. Once thickened, remove the saucepan from the heat and let it cool a bit.
Step 4: Add Flavorings
Once the sauce has cooled to room temperature, stir in 1 cup of grated Asiago cheese, 1 tablespoon of chopped fresh rosemary, 1 teaspoon each of smoked paprika and ground sage, and season with 1 teaspoon of kosher salt and freshly ground black pepper to taste. Additionally, grate in a pinch of freshly grated nutmeg to enhance the flavors before setting the sauce aside.
Step 5: Slice Sweet Potatoes
Using a mandoline slicer or a sharp knife, slice 3 to 4 medium sweet potatoes into uniform ⅜-inch thick rounds. This ensures they cook evenly in your Sweet Potato Gratin with Smoked Gouda and Rosemary. Aim for consistency in thickness for the best texture and visual appeal.
Step 6: Arrange the Layers
In your prepared baking dish, start layering the sweet potato slices, covering the bottom in an even layer. Pour half of the creamy sauce over the potatoes, ensuring the slices are well coated. Use a spatula to gently mix and distribute the sauce if necessary, creating a beautiful balance of flavors.
Step 7: Finish Layering
Continue layering the remaining sweet potato slices on top of the first layer, building up towards the center. Once completed, pour the rest of the creamy sauce over the final layer, making sure all the slices are submerged. This promotes creamy, tender potatoes throughout your gratin while baking.
Step 8: Top It Off
To create a delectable crust, generously sprinkle with ½ cup of shredded smoked Gouda cheese and ½ cup of shredded Colby Jack cheese. This cheesy topping is essential for that rich, gooey finish that makes the Sweet Potato Gratin with Smoked Gouda and Rosemary truly irresistible.
Step 9: Bake Covered
Cover the dish tightly with aluminum foil to trap steam, which helps the sweet potatoes cook through. Bake in the preheated oven for 45 to 50 minutes until sweet potatoes are tender. You can check doneness by gently inserting a fork through the foil; they should yield easily.
Step 10: Brown the Top
After the initial baking time, carefully remove the foil and return the gratin to the oven. Allow it to bake uncovered for an additional 15 to 20 minutes, or until the top is golden brown and bubbly. Keep a close eye to avoid over-browning and ensure a perfect finish.
Step 11: Cool and Serve
Once baked to perfection, remove the gratin from the oven and let it rest for about 10 to 15 minutes. This resting period allows the layers to set and makes serving easier. Slice into portions, ready to share this delightful Sweet Potato Gratin with Smoked Gouda and Rosemary with family and friends.

How to Store and Freeze Sweet Potato Gratin
Fridge: Store any leftovers of your Sweet Potato Gratin with Smoked Gouda and Rosemary in an airtight container for up to 3 days. Make sure it’s completely cooled before sealing to maintain freshness.
Freezer: For longer storage, freeze the gratin in a freezer-safe container. It can last up to 2 months. When ready to enjoy, thaw overnight in the refrigerator before reheating.
Reheating: Reheat your gratin in the oven at 350°F (175°C), covered with foil to prevent drying out. Bake for approximately 20-25 minutes or until warmed through.
Serving Tip: Let it rest for a few minutes after re-heating to ensure the layers are nicely set before serving.
What to Serve with Sweet Potato Gratin with Smoked Gouda and Rosemary
Elevate your holiday meal with delightful sides that beautifully complement this creamy, savory gratin.
-
Savory Roasted Chicken: The crisp, golden skin and juicy meat pair wonderfully with the rich creaminess of the gratin, creating a comforting main dish.
-
Herb-Seasoned Green Beans: Their crunchy texture and fresh flavor cut through the sweetness of the potatoes, offering a wonderful balance of taste and texture.
-
Garlic Butter Mushrooms: Earthy and tender, these mushrooms add a depth of flavor that enhances the allergens like smoked Gouda, while their juicy nature complements the gratin’s richness beautifully.
-
Cranberry Sauce: This tart and sweet condiment provides a refreshing contrast to the creamy potatoes, brightening each bite with its vibrant flavor, making it a festive addition.
-
Roasted Brussels Sprouts: Their crispy exterior and tender interior add a delightful crunch that offsets the soft layers of the gratin, while their slight bitterness pairs perfectly with the cheesy richness.
-
Classic Caesar Salad: The crisp romaine, tangy dressing, and crunchy croutons add freshness and a zesty note, balancing the indulgent flavors of the gratin beautifully.
-
Mulled Wine: The warm spices in this drink harmonize perfectly with the rosemary and smoked flavors in the gratin, making it the perfect accompaniment for your holiday feast.
Sweet Potato Gratin with Smoked Gouda Variations
Feel free to let your creativity shine by customizing this delicious gratin to suit your taste buds and dietary needs!
- Dairy-Free: Substitute all cheeses and cream with coconut cream and vegan cheese for a dairy-free delight.
- Extra Herbaceous: Add thyme or sage along with rosemary to deepen the flavor profile and give it a rich herbaceous lift.
- Spicy Kick: Incorporate a pinch of red pepper flakes or a dash of hot sauce to spice things up and awaken your palate.
- Nutty Flavor: Mix in a sprinkle of toasted walnuts or pecans for a delightful crunch that complements the creaminess of the gratin.
- Cheesy Upgrade: Use a combination of Gruyère and sharp Cheddar for an extra cheesy experience that will have your family coming back for seconds!
- Zesty Twist: Adding a touch of lemon zest before baking will brighten the flavors, cutting through the richness of the dish beautifully.
- Roasted Vegetables: Layer in some sautéed spinach or roasted bell peppers for added color and nutrients, making it a heartier option.
- Comfort Food Add-In: Try layering crispy bacon or pancetta for that irresistible savory bite that everyone adores.
With its incredible flexibility, this Sweet Potato Gratin with Smoked Gouda and Rosemary is perfect for tuning into your preferences. Want to explore even more options? Check out this delightful Savory Bread Pudding with Mushrooms and Gruyere for other delicious twists!
Expert Tips for Sweet Potato Gratin
Uniform Slices: Ensure even cooking by using a mandoline slicer for your sweet potatoes. Consistent thickness around ⅜ inch helps them cook perfectly.
Cool the Sauce: Always let your creamy sauce cool to room temperature before adding cheese. This prevents clumps and ensures a smooth consistency in your Sweet Potato Gratin with Smoked Gouda and Rosemary.
Cover for Moisture: Bake your gratin covered with foil during the first part of cooking. This traps steam, helping the potatoes cook through without burning the cheese.
Watch the Browning: When uncovering the dish towards the end, keep a watchful eye! Broil briefly at the end for a golden crust, but remove it promptly to avoid burning.
Rest Before Serving: Allow the gratin to rest for 10-15 minutes after baking. This helps the layers set and makes slicing much easier without falling apart.
Make Ahead Options
This Sweet Potato Gratin with Smoked Gouda and Rosemary is perfect for busy home cooks looking to save time during holiday preparations! You can slice the sweet potatoes and assemble the entire gratin up to 24 hours in advance. Simply layer the sliced potatoes in the greased baking dish, pour the cooled sauce over, and cover tightly with plastic wrap. To maintain its quality, refrigerate until ready to bake. When you’re ready to serve, just pop it in a preheated oven and bake as directed, adding an extra 10-15 minutes if baking straight from the fridge. This way, you’ll enjoy a comforting, delicious dish with minimal effort!

Sweet Potato Gratin with Smoked Gouda and Rosemary Recipe FAQs
How do I choose the right sweet potatoes for this dish?
Absolutely! Look for sweet potatoes that are firm with smooth, unblemished skin. Avoid any with dark spots or soft spots, as these can indicate spoilage or poor quality. A medium-sized sweet potato is usually a perfect choice, but if you find larger ones, just make sure to adjust your slicing for even cooking.
What is the best way to store leftover Sweet Potato Gratin?
To store your delicious Sweet Potato Gratin, place it in an airtight container and refrigerate for up to 3 days. Make sure the gratin is completely cooled before sealing to maintain its freshness. When you’re ready to enjoy it again, simply reheat in the oven to bring back that creamy goodness!
Can I freeze Sweet Potato Gratin?
Yes, you can definitely freeze this savory dish! Let the gratin cool completely, then transfer it to a freezer-safe container. It will keep well for up to 2 months. When you’re ready to savor it, simply thaw it overnight in your refrigerator, then reheat it in the oven at 350°F, covered with foil to prevent it from drying out.
What if my sauce doesn’t thicken properly?
Very! If your sauce isn’t thickening, you can simply continue cooking it for another minute or two while stirring continuously. If it’s still too thin, mix a small amount of additional flour with a bit of cream until smooth, then whisk that mixture back into the sauce and cook for a few more minutes until thickened. This way, you’ll achieve that luscious texture that is key to a delightful gratin.
Can I make this dish gluten-free?
Certainly! To make this Sweet Potato Gratin with Smoked Gouda and Rosemary gluten-free, just substitute the all-purpose flour with a gluten-free blend. Many all-purpose gluten-free flours work well in sauces. This way, everyone can enjoy this festive delight without worry!
Is this dish safe for pets?
While sweet potatoes are safe for dogs in moderation, be sure to consult with your veterinarian regarding any shared human food. The other ingredients, especially garlic and onions, are not safe for pets. Make this scrumptious dish a human-only treat, guaranteed to keep tails wagging while ensuring your furry friends stay safe!

Irresistible Sweet Potato Gratin with Smoked Gouda & Rosemary
Ingredients
Equipment
Method
- Preheat your oven to 400°F (200°C) and prepare a 9x13-inch baking dish by greasing it lightly with butter or cooking spray.
- In a large saucepan, melt the butter over medium heat. Add minced garlic and chopped red onion, sautéing until the onion is soft and translucent—about 5 minutes.
- Sprinkle in the all-purpose flour, stirring continuously for about 1 minute. Gradually whisk in heavy cream and half and half, cooking until it thickens slightly—around 3 to 4 minutes.
- Once thickened, remove the saucepan from the heat and let it cool a bit before stirring in grated Asiago cheese, chopped rosemary, smoked paprika, ground sage, kosher salt, and black pepper, along with a pinch of freshly grated nutmeg.
- Slice the sweet potatoes into uniform ⅜-inch thick rounds using a mandoline slicer or a sharp knife.
- Layer the sweet potato slices in the baking dish, covering the bottom with an even layer. Pour half of the creamy sauce over the potatoes.
- Continue layering the remaining sweet potato slices on top and pour the rest of the creamy sauce over the final layer.
- Sprinkle with shredded smoked Gouda cheese and shredded Colby Jack cheese.
- Cover tightly with aluminum foil to trap steam, and bake for 45 to 50 minutes until sweet potatoes are tender.
- Remove foil and bake uncovered for an additional 15 to 20 minutes until the top is golden brown and bubbly.
- Once baked, let the gratin rest for about 10 to 15 minutes before serving.

Leave a Reply