Scalloped Sweet Potatoes are a simple, cozy dish that brings together tender, thinly sliced sweet potatoes baked in a creamy sauce with just a touch of cheese. The edges get a little crispy while the inside stays soft and smooth, making each bite comforting and satisfying. It’s a great way to enjoy sweet potatoes with a twist that feels special but isn’t complicated to make.
I love making this dish when I want something warm and a little special on the table without too much fuss. The creamy sauce makes the sweet potatoes feel extra cozy, and the subtle flavors go well with a variety of main dishes. Pro tip: letting the dish sit for a few minutes after baking helps it set up so it slices nicely and doesn’t fall apart when you serve it.
This is my go-to side for holiday meals or any dinner when I want a little comfort food that still feels fresh. It’s also a great way to get a lovely balance of sweetness and creaminess on your plate, and I’ve noticed everyone tends to ask for seconds. I like to serve it alongside roasted chicken or a simple salad to keep the meal light but filling.
Key Ingredients & Substitutions
Sweet Potatoes: They are the star here. Choose firm, bright orange sweet potatoes for sweetness and texture. If you prefer, you can swap with regular potatoes, but the flavor and color will differ.
Cheddar Cheese: Adds a nice sharpness and creaminess. If you’re avoiding dairy, skip it or try a dairy-free cheese like nutritional yeast or vegan cheddar.
Milk: Whole milk makes the sauce creamy. For a richer dish, use cream. For a lighter version, skim milk or plant-based milk works, though the sauce may be less thick.
Thyme: Fresh thyme gives a delicate herbal note. You can swap dried thyme or rosemary if you like a different flavor profile.
How Do You Get Perfectly Tender Sweet Potatoes with a Creamy Sauce?
Thinly slice your sweet potatoes about 1/8 inch thick. This helps them cook evenly and blend with the sauce.
- Cook the onions and garlic slowly to soften and bring out flavor before adding flour.
- Make a smooth roux by stirring flour with butter-coated onions, then whisk in milk gradually to avoid lumps.
- Simmer until the sauce thickens nicely—it should coat the back of a spoon.
- Layer potatoes evenly, pour sauce slowly to cover slices fully.
- Covering with foil during the first bake traps steam, softening the potatoes. Removing foil at the end lets the top brown.
- Let the dish rest after baking so it firms up for easier serving.
Equipment You’ll Need
- 9×13-inch baking dish – perfect size for even cooking and easy layering of sweet potatoes.
- Medium saucepan – to make the creamy sauce without burning.
- Whisk – helps you get a smooth sauce by mixing flour and milk well.
- Sharp knife or mandoline slicer – for thin, even sweet potato slices that cook through perfectly.
- Wooden spoon – great for stirring the sauce and preventing sticking.
Flavor Variations & Add-Ins
- Add cooked crumbled bacon for a smoky, salty contrast that pairs well with the sweetness.
- Stir in chopped fresh sage instead of thyme for an earthier herb flavor.
- Mix in grated Gruyère cheese for a nuttier, creamier topping.
- Include sautéed mushrooms or caramelized onions for more depth and texture.
How to Make Scalloped Sweet Potatoes?
Ingredients You’ll Need:
Sweet Potatoes:
- 3 large sweet potatoes (about 2 pounds), peeled and thinly sliced
Sauce and Seasoning:
- 2 tablespoons unsalted butter
- 1 medium onion, thinly sliced
- 2 cloves garlic, minced
- 2 tablespoons all-purpose flour
- 1 ½ cups whole milk (or cream for richer dish)
- ½ cup grated sharp cheddar cheese (optional for added flavor)
- 1 teaspoon fresh thyme leaves (or ½ teaspoon dried thyme)
- Salt and freshly ground black pepper, to taste
- Fresh thyme sprigs, for garnish (optional)
How Much Time Will You Need?
This recipe takes about 15 minutes of preparation time, plus 55 to 60 minutes of baking. After baking, allow 10 to 15 minutes for resting before serving, so the dish sets nicely.
Step-by-Step Instructions:
1. Preparing the Oven and Baking Dish:
Preheat your oven to 375°F (190°C). Lightly grease a medium baking dish, about 9×13 inches, so the sweet potatoes don’t stick and it’s easy to clean later.
2. Making the Creamy Sauce:
In a medium saucepan, melt the butter over medium heat. Add the thinly sliced onion and cook it until soft and translucent—this should take about 5 minutes. Add the minced garlic and cook for just 1 more minute, stirring often to avoid burning. Then sprinkle the flour over the onions and garlic, stirring constantly for 1 to 2 minutes to form a roux.
Slowly whisk in the milk, stirring continuously to keep the sauce smooth. Let it cook for about 5 minutes until the sauce thickens and begins to gently bubble. Remove the pan from heat, then stir in half of the cheese (if using), thyme leaves, salt, and pepper. Taste the sauce and adjust the seasoning if needed.
3. Assembling and Baking the Dish:
Arrange the thin slices of sweet potatoes evenly in the prepared baking dish, overlapping them slightly. Pour the creamy sauce evenly over all the slices, making sure each piece gets coated. Sprinkle the remaining cheese on top if you want a cheesy crust.
Cover the baking dish with foil and bake for 35 minutes. Then remove the foil and bake uncovered for another 20 to 25 minutes until the top turns golden and bubbly, and the sweet potatoes are soft when poked with a fork.
4. Resting and Serving:
Once baked, let your scalloped sweet potatoes rest for 10 to 15 minutes. This helps the dish set, making it easier to slice and serve. Garnish with fresh thyme sprigs if you like. Serve warm and enjoy!
Can I Use Frozen Sweet Potato Slices?
Yes, but make sure to thaw them completely and pat dry to remove excess moisture before using. This helps prevent the dish from becoming watery and ensures even cooking.
Can I Make Scalloped Sweet Potatoes Ahead of Time?
Absolutely! You can assemble the dish up to a day in advance. Cover it tightly and keep it refrigerated. When ready, bake it as directed, adding a few extra minutes if baking straight from the fridge.
What Can I Substitute for the Cheese?
If you want to skip cheddar, you can use Gruyère, mozzarella, or parmesan for a different flavor. For dairy-free, try a plant-based cheese or skip it entirely—the sauce will still be creamy and delicious.
How Should I Store Leftovers?
Store leftovers in an airtight container in the fridge for up to 3 days. Reheat gently in the oven or microwave until warm, adding a splash of milk if the sauce seems thickened.