Scalloped Sweet Potatoes are a simple, cozy dish that combines tender, thinly sliced sweet potatoes with a creamy, cheesy sauce that bakes up golden and bubbly. The mix of sweet and savory flavors makes it a perfect side for any comforting meal, especially during the cooler months. The soft layers of sweet potato paired with melted cheese always feel like a warm hug from the inside.
I love making scalloped sweet potatoes because they’re easy to prepare but look like you put in a lot of effort. I usually add a little nutmeg or cinnamon to bring out the natural sweetness, and sometimes sprinkle a bit of crunchy topping like breadcrumbs or nuts for a nice texture contrast. It’s one of those dishes that everyone seems to enjoy, whether for a weeknight dinner or a holiday gathering.
When I serve scalloped sweet potatoes, I like to pair them with roasted chicken or a simple green salad to balance out the richness. Leftovers reheat well, too, which makes it an excellent make-ahead option. It’s a great way to get a little extra veggie into the meal without anyone feeling like they’re missing out on flavor or comfort.
Key Ingredients & Substitutions
Sweet Potatoes: Choose firm, fresh sweet potatoes for the best texture. If needed, you can substitute with yams or even regular potatoes, though the flavor will be different.
Cheese: Sharp cheddar adds great flavor and meltiness. You can swap it for mozzarella or Gruyère if you prefer a milder, creamier taste.
Milk: Whole milk works well here, but for a richer dish, try cream or half-and-half. For a lighter version, use low-fat milk or a plant-based milk like oat or almond, though it may affect the sauce thickness slightly.
Butter & Flour: These form the roux that thickens the sauce. For dairy-free options, use olive oil with gluten-free flour, but note the texture might differ.
How Can I Make Sure the Sauce Is Smooth and Creamy?
Making a smooth cheese sauce (béchamel) is key to this dish’s delicious texture. Follow these steps for success:
- Melt butter over medium heat, then add garlic and onion, cooking gently until soft.
- Sprinkle flour evenly and stir constantly for about 1 minute to cook out the raw taste.
- Slowly whisk in cold or room-temp milk bit by bit to avoid lumps.
- Keep whisking until the sauce thickens and coats the back of a spoon.
- Remove from heat before adding cheese—this keeps the sauce velvety.
- Stir cheese in slowly so it melts evenly.
Patience is key—rushing can cause lumps or a grainy texture. A smooth sauce will soak the sweet potatoes perfectly and bake up creamy and rich.
Equipment You’ll Need
- 9×13 inch baking dish – perfect size for layering and baking the sweet potatoes evenly.
- Medium saucepan – to make the creamy cheese sauce without burning.
- Whisk – helps keep the sauce smooth and lump-free while cooking.
- Sharp knife or mandoline slicer – for slicing sweet potatoes thin and evenly.
- Wooden spoon or spatula – great for stirring the sauce and scraping the pan.
Flavor Variations & Add-Ins
- Add cooked crumbled bacon or diced ham for a smoky, salty twist that pairs well with the sweetness.
- Mix in fresh rosemary or sage with the cheese sauce for an earthy, herbal note.
- Swap cheddar for Gruyère or mozzarella to change the cheese flavor to nutty or mild and gooey.
- Stir in chopped spinach or kale layers for added greens and texture.
How to Make Scalloped Sweet Potatoes
Ingredients You’ll Need:
For The Sweet Potatoes:
- 4 large sweet potatoes, peeled and thinly sliced (about 4 cups)
For The Cheese Sauce:
- 2 tablespoons unsalted butter
- 2 cloves garlic, minced
- 1 small onion, finely chopped
- 2 tablespoons all-purpose flour
- 1 1/2 cups whole milk (or cream for richer)
- 1 cup sharp cheddar cheese, shredded (plus extra for topping)
- 1/2 teaspoon salt
- 1/4 teaspoon black pepper
- 1/4 teaspoon ground nutmeg (optional)
For Garnish:
- Fresh thyme leaves or chopped parsley
- 1/4 cup grated Parmesan cheese (optional for topping)
How Much Time Will You Need?
This recipe takes about 15 minutes to prepare and about 55-60 minutes to bake, plus a short resting time of 5-10 minutes before serving. In just under an hour and a half, you’ll have a creamy, flavorful side dish ready to enjoy!
Step-by-Step Instructions:
1. Prepare and Sauté Aromatics:
Preheat your oven to 375°F (190°C) and grease a 9×13 inch baking dish with butter or non-stick spray. In a medium saucepan, melt the butter over medium heat. Add the minced garlic and chopped onion, cooking them until soft and fragrant, about 3-4 minutes.
2. Make the Cheese Sauce:
Stir the flour into the butter mixture and cook for about 1 minute, stirring constantly to form a roux. Gradually whisk in the milk, checking to avoid lumps. Continue whisking and cook until the sauce slightly thickens, usually 4-5 minutes. Take the sauce off the heat, then stir in shredded cheddar cheese, salt, pepper, and nutmeg if you’re using it. Stir until the cheese melts and the sauce is smooth.
3. Layer and Bake:
Arrange half of the sliced sweet potatoes in overlapping rows in the baking dish. Pour half of the cheese sauce evenly over them. Layer the remaining sweet potatoes on top, then pour the rest of the cheese sauce over it. If you like, sprinkle extra cheddar and Parmesan cheese over the top for a crisp golden crust. Cover the dish with foil.
4. Cook and Serve:
Bake covered for 30 minutes, then remove the foil and bake for another 25-30 minutes until the sweet potatoes are soft and the top is bubbly and golden. Let the casserole rest for 5-10 minutes before serving. Garnish with fresh thyme leaves or parsley for a lovely finishing touch.
Can I Use Frozen Sweet Potatoes for This Recipe?
It’s best to use fresh sweet potatoes for optimal texture and flavor. If using frozen, make sure they are fully thawed and patted dry to avoid excess moisture, which can make the dish watery.
Can I Make Scalloped Sweet Potatoes Ahead of Time?
Absolutely! Prepare the dish up to the baking step, cover it with foil, and refrigerate for up to 24 hours. When ready, bake as directed, adding a little extra cooking time if baking straight from the fridge.
How Should I Store Leftovers?
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat covered in the oven at 350°F (175°C) until warmed through, or microwave in shorter intervals to keep the sauce creamy.
Can I Make This Dish Dairy-Free?
Yes! Substitute dairy milk with unsweetened plant-based milk like almond or oat, and use a dairy-free butter alternative. For cheese, try vegan cheese shreds, though the flavor and texture may vary slightly.
