Sweet Potato Casserole with Marshmallows is a classic comfort-food side dish that brings together creamy sweet potatoes, warm fall spices, buttery richness, and a golden layer of toasted marshmallows. It is especially popular for Thanksgiving and holiday dinners, but it is simple enough to enjoy whenever you want a cozy, crowd-pleasing side.

The sweet potatoes are cooked until tender, mashed until smooth, and blended with butter, brown sugar, cinnamon, vanilla, and a touch of milk. The mixture is then baked until warm and bubbly before being finished with fluffy marshmallows that turn beautifully golden on top. The combination of creamy, sweet, and lightly toasted flavors makes this casserole hard to resist.

Why You’ll Love This Sweet Potato Casserole

Easy to prepare: Simple ingredients and straightforward steps make this beginner-friendly.
Creamy and flavorful: Mashed sweet potatoes create a naturally smooth and rich base.
Perfectly sweet: Brown sugar and vanilla complement the natural sweetness of the potatoes.
Beautiful presentation: Toasted marshmallows create an irresistible golden topping.
Great for holidays: It pairs wonderfully with turkey, ham, roasted vegetables, and other festive dishes.
Make-ahead friendly: Much of the preparation can be done before serving.

Sweet Potato Casserole with Marshmallows Recipe

Prep Time

20 minutes

Cook Time

35–40 minutes

Total Time

About 1 hour

Servings

8–10

Ingredients

For the Sweet Potato Filling

3 pounds sweet potatoes
4 tablespoons unsalted butter, melted
½ cup brown sugar
½ cup milk
2 large eggs
1 teaspoon vanilla extract
1 teaspoon ground cinnamon
¼ teaspoon ground nutmeg
½ teaspoon salt

For the Topping

2–3 cups mini marshmallows
2 tablespoons chopped pecans, optional
A small pinch of cinnamon, optional

Step-by-Step Instructions

Step 1: Prepare the Sweet Potatoes

Wash and peel the sweet potatoes. Cut them into similarly sized chunks so they cook evenly.

Place them in a large pot and cover with water. Bring the water to a boil and cook for approximately 15–20 minutes, or until the sweet potatoes are very tender when pierced with a fork.

Drain thoroughly and allow them to cool for a few minutes.

Step 2: Mash the Sweet Potatoes

Transfer the cooked sweet potatoes to a large mixing bowl.

Mash them with a potato masher until mostly smooth. For an extra-smooth casserole, you can use a hand mixer briefly.

Avoid overmixing, as excessive mixing can make the texture less pleasant.

Step 3: Add the Flavor

Pour in the melted butter and milk.

Add brown sugar, eggs, vanilla extract, cinnamon, nutmeg, and salt. Stir until everything is well incorporated and the mixture is creamy.

Taste the mixture and adjust the sweetness or spices if desired.

Step 4: Prepare the Baking Dish

Preheat your oven to 350°F (175°C).

Lightly grease a 9 × 13-inch baking dish with butter or cooking spray.

Transfer the sweet potato mixture into the dish and spread it into an even layer using a spatula.

Step 5: Add the Marshmallows

Arrange mini marshmallows evenly over the entire surface of the sweet potato mixture.

If you enjoy a little crunch, sprinkle chopped pecans between or over the marshmallows.

For a more lightly toasted finish, you can reserve some marshmallows and add them during the final few minutes of baking.

Step 6: Bake the Casserole

Place the casserole in the preheated oven and bake for approximately 25–30 minutes, until the filling is hot and the marshmallows have puffed up.

If the marshmallows begin browning too quickly, loosely cover the dish with foil.

Step 7: Toast the Marshmallows

For an especially golden topping, switch to the broiler for the final 1–2 minutes.

Watch carefully because marshmallows can go from golden to burnt very quickly.

Remove the casserole from the oven when the marshmallows are beautifully toasted.

Step 8: Let It Rest and Serve

Allow the casserole to rest for about 5–10 minutes before serving.

This gives the filling a chance to settle while keeping the marshmallow topping soft and golden.

Serve warm alongside your favorite holiday dishes.

Tips for the Best Sweet Potato Casserole

Choose the Right Sweet Potatoes

Look for firm sweet potatoes without soft spots or significant blemishes. Similar-sized potatoes cook more evenly.

Don’t Make the Filling Too Wet

Drain the cooked sweet potatoes thoroughly before mashing. Excess water can make the casserole loose.

Balance the Sweetness

Sweet potatoes are naturally sweet, so start with the recommended amount of brown sugar and adjust according to your preference.

Toast the Marshmallows Carefully

Keep a close eye on the casserole when using the broiler. Marshmallows brown extremely quickly.

Add Pecans for Crunch

Chopped pecans provide a delicious contrast to the soft sweet potato filling and fluffy marshmallows.

Use Fresh Spices

Cinnamon and nutmeg contribute a lot of the casserole’s cozy flavor, so fresh, fragrant spices make a noticeable difference.

Make-Ahead Instructions

Sweet Potato Casserole is particularly convenient when you’re preparing a large holiday meal.

Prepare the sweet potato filling and spread it into the baking dish. Cover and refrigerate it until you’re ready to bake.

When ready, allow the casserole to sit at room temperature briefly while the oven preheats. Add the marshmallows just before baking, then bake until heated through and golden.

If the casserole is very cold, it may need additional baking time.

What to Serve with Sweet Potato Casserole

This casserole works beautifully alongside savory holiday dishes. Try serving it with:

Roast turkey
Baked ham
Roast chicken
Green bean casserole
Garlic mashed potatoes
Roasted Brussels sprouts
Cranberry sauce
Homemade dinner rolls
Herb-roasted vegetables
Gravy

The sweet and creamy casserole creates a delicious contrast with savory roasted meats and vegetables.

Variations to Try

Pecan Marshmallow Topping

Add chopped pecans underneath the marshmallows for extra crunch.

Maple Sweet Potato Casserole

Replace some of the brown sugar with pure maple syrup for a deeper fall-inspired flavor.

Cinnamon Streusel Topping

Skip the marshmallows and top the casserole with a buttery cinnamon-pecan streusel.

Orange-Spiced Version

Add a little fresh orange zest to the sweet potato mixture for a bright citrus note.

Less-Sweet Version

Reduce the brown sugar and let the natural sweetness of the sweet potatoes shine.

Frequently Asked Questions

Can I use canned sweet potatoes?

Yes. Canned sweet potatoes can save time, but drain them very well before mashing. Check whether they contain added syrup and reduce the added sugar accordingly.

Can I make sweet potato casserole ahead of time?

Yes. Prepare the sweet potato filling in advance, cover it, and refrigerate it. Add the marshmallows shortly before baking for the best topping.

Why is my sweet potato casserole watery?

The most common reason is excess moisture in the cooked sweet potatoes. Drain them thoroughly before mashing and avoid adding too much milk.

Can I use large marshmallows instead of mini marshmallows?

Yes. Large marshmallows can be used, although cutting them into smaller pieces can help distribute them more evenly across the casserole.

Can I freeze sweet potato casserole?

The sweet potato filling can be frozen, but the marshmallow topping is best added fresh after thawing. Freeze the prepared filling in a freezer-safe container, thaw it in the refrigerator, then add the topping before baking.

How do I keep the marshmallows from burning?

Bake the casserole until hot, then add the marshmallows toward the end if necessary. You can also briefly broil the finished casserole while watching it closely.

Can I make this casserole without eggs?

Yes. Eggs help give the filling structure, but they can be omitted for a softer, more pudding-like casserole. You may need to slightly adjust the milk to achieve the desired consistency.

How long does leftover sweet potato casserole last?

Store leftovers covered in the refrigerator and enjoy them within a few days. Reheat individual portions in the microwave or warm the casserole gently in the oven.

Conclusion

Sweet Potato Casserole with Marshmallows is the kind of comforting side dish that can make a holiday meal feel extra special. Creamy mashed sweet potatoes, brown sugar, warm cinnamon, buttery richness, and fluffy toasted marshmallows come together in one beautiful casserole that is both easy to prepare and impressive to serve.

Whether you’re making it for Thanksgiving, Christmas, a family dinner, or a fall gathering, this recipe is a delicious addition to the table. Prepare the filling ahead of time, add those marshmallows before baking, and you’ll have a warm, golden, crowd-pleasing dish ready to share.