These scalloped sweet potatoes are creamy, savory, and wildly cozy, with layers of tender sweet potatoes baked in a rich Gruyère sauce. They’re easy to prep, make-ahead friendly, and exactly the kind of side dish people hover over before dinner.
This post may contain affiliate links. As an Amazon Associate, I earn from qualifying purchases. Please see my disclosure policy for details.
Table of Contents
For more cozy holiday-worthy side dish recipes, check out my Creamed Peas, Roasted Potatoes and Carrots, Corn Soufflé, and Cheesy Zucchini Casserole.
At A Glance: Scalloped Sweet Potatoes
- Prep Time: 10 minutes
- Cook Time: 1 hour 15 minutes
- Total time: 1 hour 25 minutes
- Makes: 8-10 servings
- Nutrition (per serving):
- What it Tastes Like: Creamy, savory, and cozy, with tender sweet potatoes and rich Gruyère in every bite.
- Why You'll Love It: It’s easy to prep, make-ahead friendly, and feels special without being fussy—perfect for holidays or cozy dinners at home.
- Difficulty Level: Easy (no roux, mostly hands-off baking)
When cooler weather hits, this is the side dish I start craving. These scalloped sweet potatoes are warm, creamy, and deeply cozy, with the perfect balance of savory and natural sweetness—no marshmallows in sight.
This scalloped sweet potato recipe skips the roux and lets the oven work its magic, baking thin slices of sweet potatoes in a rich Gruyère sauce until tender and golden. It’s special enough for holidays but easy enough for cozy dinners at home—and yes, people always go back for seconds.
If you’re loving sweet potato side dish recipes lately, don’t miss my Sweet Potato Soufflé, Dutch Oven Sweet Potatoes, and Candied Whipped Sweet Potatoes.
Important Ingredients and Substitutions
Sweet Potatoes — Use medium sweet potatoes, sliced into thin, even ⅛-inch rounds to ensure even cooking. A mandoline slicer helps, but a sharp knife works just fine if you cut carefully.
Gruyère Cheese — Adds a rich, nutty flavor and melts smoothly into the sauce. If needed, substitute with Swiss, fontina, or a mix of sharp white cheddar and Parmesan for a similar savory profile. Freshly shredded melts best.
Milk — 1% or 2% milk keeps the dish creamy without being too heavy. Whole milk works as well; heavy cream can be used for a richer result, but the sauce will be thicker and more indulgent.
All-Purpose Flour — Thickens the milk into a creamy sauce during baking. For a gluten-free option, use a 1:1 gluten-free flour blend with similar results.
Onion — Yellow or white onion adds savory depth that balances the natural sweetness of the potatoes. Shallots can be used for a milder flavor.
Dried Thyme — Adds a subtle, earthy note that pairs well with Gruyère. Fresh thyme can be used instead—about 1½ teaspoons, finely chopped.
Recipe Variations
This dish is cozy perfection on its own—but it’s also easy to make it your own. Here are a few fun variations to try:
- Cheesy Upgrade — Add a handful of freshly grated Parmesan or sharp white cheddar to the Gruyère for extra depth and a slightly bolder cheese flavor.
- Garlic Lover’s Version — Add 1–2 cloves of finely minced garlic to the milk mixture for a subtle savory boost that pairs beautifully with the sweet potatoes.
- Bacon & Onion — Sprinkle cooked, crumbled bacon between the layers for a smoky, savory twist that works especially well for holiday meals.
- Mixed Potato Bake — Use half sweet potatoes and half Yukon Gold potatoes for a striking color contrast and a more classic scalloped-potato feel.
- Extra Cozy Spices — Add a pinch of nutmeg or a small amount of fresh rosemary to enhance the warm, savory flavor without overpowering the dish.
How to Make Scalloped Sweet Potatoes
For the complete recipe and measurements, scroll to the recipe card at the bottom of this post.
Prepare: Preheat the oven to 375°F. Lightly grease an 8×8-inch baking dish with nonstick spray or butter.
Step 1: Arrange one-third of the sliced sweet potatoes in an even layer in the baking dish. Top with one-third of the onions, salt, dried thyme, Gruyère cheese, butter cubes, and freshly cracked black pepper.
Step 2: Repeat this layering process two more times with the remaining ingredients.
Step 3: In a large mixing bowl, vigorously whisk together the milk and flour until completely smooth and frothy, with no visible lumps.
Step 4: Immediately pour the milk mixture evenly over the layered potatoes. Cover the baking dish tightly with aluminum foil or an oven-safe lid
Step 5: Bake covered for 40 minutes. Remove the foil or lid and continue baking for 30–35 minutes, until the cheese is golden brown and the potatoes are fork-tender.
Let the dish rest at room temperature for 5–10 minutes before serving.
Chelsea's Recipe Pro-Tips
- Slice the potatoes evenly. Thin, uniform slices (about ⅛ inch) ensure the sweet potatoes cook through evenly, giving that perfectly tender, creamy texture in every bite.
- Whisk the milk mixture thoroughly. Vigorously whisking the milk and flour until smooth and frothy helps the sauce thicken evenly in the oven and prevents lumps.
- Pour the sauce immediately. Adding the milk mixture immediately after whisking keeps the flour suspended, ensuring it coats the potatoes evenly as they bake.
- Cover tightly for the first bake. Keeping the dish covered allows the potatoes to steam and soften before the cheese browns, preventing dry edges.
- Rest before serving. Letting the dish sit for 5–10 minutes helps the sauce set, making it easier to slice and serve cleanly.
- Freshly shred the cheese if possible. Freshly shredded Gruyère melts more smoothly than pre-shredded cheese, which can contain anti-caking agents that affect texture.
Storage Directions
- Storing: Allow leftovers to cool completely, then store in an airtight container in the refrigerator for up to 5 days. The potatoes do not freeze well, as the sauce may separate upon thawing.
- Reheating: Warm individual portions in the microwave for 1–2 minutes, or reheat covered in a 350°F oven until heated through.
Serving Suggestions
These scalloped sweet potatoes pair well with savory mains such as bacon-wrapped pork tenderloin, roasted turkey breast, or flat-iron steak. They’re hearty enough for holidays and cozy enough to feel right at home on a weeknight table.
Scalloped Sweet Potatoes FAQs
Yes. You can assemble the dish up to a day in advance, cover it tightly, and refrigerate it. When ready to bake, let it sit at room temperature for about 20 minutes, then bake as directed.
No. A mandoline makes quick work of slicing, but a sharp knife works just fine. The most important thing is keeping the slices thin and even so they cook through properly.
Yes. Swiss, fontina, or a mix of white cheddar and Parmesan all work well. Choose cheeses that melt smoothly to keep the dish savory.
This usually means the slices were too thick or the dish wasn’t covered tightly during the first bake. Thin slices and a well-sealed cover help the potatoes steam and soften before browning.
Freezing isn’t recommended. The creamy sauce can separate once thawed, which affects the texture and overall quality.
Save this Recipe for Later on Pinterest
More Holiday Side Dish Recipes
If you liked and made this Scalloped Sweet Potatoes Recipe, don't forget to rate it and let me know how you liked it in the comments. I always love hearing from you!
Recipe Card
Scalloped Sweet Potatoes
Ingredients
- nonstick cooking spray
- 3 medium sweet potatoes peeled and sliced into ⅛-inch rounds
- ½ medium yellow or white onion sliced into thin rings
- ¾ teaspoon salt
- ½ teaspoon dried thyme
- 1 ¾ cups shredded Gruyère cheese freshly shredded if possible
- ¼ cup unsalted butter cut into small cubes
- freshly cracked black pepper to taste
- 2 ¼ cups milk such as 1% or 2%
- 6 tablespoons all-purpose flour
Instructions
- Preheat the oven to 375°F.
- Spray an 8 x 8-inch baking dish with nonstick cooking spray or grease with butter.
- Arrange one-third of the sliced sweet potatoes in an even layer in the baking dish. Sprinkle with one-third of the onions, salt, dried thyme, Gruyère cheese, butter, and freshly cracked black pepper. Repeat the layering process two more times with the remaining ingredients.
- In a large mixing bowl, vigorously whisk together the milk and flour until smooth, frothy, and no lumps remain.
- Immediately pour the milk mixture evenly over the layered potatoes.
- Cover the baking dish tightly with aluminum foil or an oven-safe lid. Bake for 40 minutes.
- Remove the foil or lid and bake for 30–35 minutes more, or until the cheese is golden brown and the potatoes are fork-tender.
- Let the potatoes rest at room temperature for 5–10 minutes, or until the cheese sauce thickens slightly. Serve warm.
Notes
- Storing — Store leftovers in an airtight container in the refrigerator for up to 5 days.
- Reheating — Warm individual portions in the microwave for 1–2 minutes, or reheat covered in a 350°F oven until hot.
- Freezing — Not recommended, as the sauce may separate once thawed.
- Slice the potatoes evenly — Uniform slices help the casserole bake evenly and give you that perfect creamy texture in every bite.
- Whisk the milk mixture well — This ensures the flour is fully dissolved and prevents lumps in your sauce.
- Rest before serving — Giving the dish a few minutes to cool lets the sauce set, making it easier to serve.
- Use freshly shredded cheese — Pre-shredded cheeses often contain anti-caking agents that prevent melting smoothly.
- Add a hint of herbs or spice — If desired, a pinch of nutmeg or rosemary adds a cozy, aromatic touch that complements the Gruyère.
I par cook the potatoes and added spinach & mushrooms and reduced milk a little