Easy Sweet Potato Casserole with Marshmallows

Easy Sweet Potato Casserole with Marshmallows is one of those holiday sides that always gets people coming back for another spoonful. The creamy sweet potato filling, warm spices, and golden marshmallow topping make it feel special without requiring complicated preparation.

I’ve found that the key is getting the filling creamy without making it overly sweet or watery, while giving the marshmallows just enough time to turn golden and gooey. A few small details make a big difference in the final texture.

If you’re looking for an easy sweet potato casserole that feels homemade, comforting, and worthy of a holiday table, this one is worth saving. Keep reading for the simple tips and variations that help make it turn out beautifully every time.

Why You’ll Love This Sweet Potato Casserole

• Creamy and comforting: Mashed sweet potatoes create a naturally rich, velvety filling.
• Golden marshmallow topping: The marshmallows become lightly toasted and wonderfully gooey.
• Simple ingredients: You don’t need a long list of specialty ingredients.
• Holiday-friendly: Perfect for Thanksgiving, Christmas, Sunday dinners, or family gatherings.
• Easy to prepare ahead: Much of the casserole can be assembled before dinner.
• Easy to customize: You can adjust the sweetness or add your favorite toppings.

Ingredients

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For the Sweet Potato Filling

• 3 pounds sweet potatoes, peeled and cut into chunks
• ¼ cup unsalted butter, melted
• ⅓ cup brown sugar
• ½ cup whole milk
• 2 large eggs
• 1 teaspoon vanilla extract
• 1 teaspoon ground cinnamon
• ¼ teaspoon ground nutmeg
• ½ teaspoon salt

For the Topping

• 2 cups mini marshmallows
• ½ cup chopped pecans, optional

How to Make Sweet Potato Casserole with Marshmallows

1. Cook the Sweet Potatoes

Place the peeled sweet potato chunks in a large pot and cover with water. Bring to a boil and cook until the potatoes are very tender when pierced with a fork, about 15–20 minutes.

Drain thoroughly and allow them to sit for a few minutes so excess moisture can evaporate.

2. Mash the Sweet Potatoes

Transfer the warm sweet potatoes to a large mixing bowl. Mash until mostly smooth.

For an especially creamy casserole, avoid leaving large pieces of potato in the mixture.

3. Add the Remaining Ingredients

Add the melted butter, brown sugar, milk, eggs, vanilla, cinnamon, nutmeg, and salt.

Mix until everything is well combined and the filling is creamy.

4. Fill the Baking Dish

Grease a 9×13-inch baking dish and spread the sweet potato mixture evenly inside.

If you’re adding pecans, sprinkle them over the top before adding the marshmallows.

5. Add the Marshmallows

Arrange the mini marshmallows evenly over the sweet potato mixture.

You want enough marshmallows to create that classic toasted topping without completely covering the casserole with a very thick layer.

6. Bake

Bake at 375°F (190°C) for about 25–30 minutes, or until the casserole is heated through and the marshmallows are puffed and golden brown.

Keep an eye on the marshmallows toward the end because they can brown quickly.

7. Rest and Serve

Let the casserole rest for about 5–10 minutes before serving. This gives the filling a chance to settle while keeping the topping warm and gooey.

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Tips for the Best Sweet Potato Casserole

Drain the potatoes well: Extra water can make the filling loose instead of creamy.

Don’t overmix the eggs: Mix just until incorporated for a smooth, tender filling.

Taste before baking: Sweet potatoes vary naturally in sweetness, so you can adjust the brown sugar to your preference.

Watch the marshmallows closely. They can go from golden to overly browned quickly.

Use fresh spices: Cinnamon and nutmeg make a noticeable difference in the overall flavor.

Don’t skip the resting time: A few minutes allows the casserole to firm up slightly before serving.

Easy Sweet Potato Casserole Variations

Sweet Potato Casserole with Pecan: Add chopped pecans over the sweet potato mixture before adding the marshmallows for extra crunch.

Streusel Topping: For a more dessert-like casserole, replace some or all of the marshmallows with a simple brown sugar and pecan streusel.

Less Sweet: Reduce the brown sugar and let the natural sweetness of the potatoes shine through.

More Spiced: Add a pinch of ground ginger or a little extra cinnamon for a warmer, more aromatic flavor.

Can You Make Crockpot Sweet Potato Casserole?

Yes. A crockpot sweet potato casserole is a convenient option when your oven is busy with the rest of a holiday meal.

Prepare the sweet potato filling as directed and transfer it to a greased slow cooker. Cook on LOW for about 3–4 hours, or until heated through.

Add the marshmallows during the final 15–20 minutes and cover until they become soft and slightly melted. If you want deeply toasted marshmallows, transfer the casserole to an oven-safe dish and briefly broil the topping instead.

Tips For the Best Sweet Potato Casserole

You can prepare the sweet potato filling up to 1 day ahead.

Prepare the mashed sweet potato mixture and spread it into your baking dish. Cover tightly and refrigerate.

When ready to bake, let the casserole sit at room temperature for about 20–30 minutes. Add the marshmallows just before baking, then bake until hot and golden.

This is especially helpful for Thanksgiving because you can get one side dish prepared before the kitchen becomes busy.

What to Serve with It

This casserole pairs beautifully with classic holiday dishes such as:

• Roast turkey
• Baked ham
• Roast chicken
• Green bean casserole
• Homemade stuffing
• Mashed potatoes
• Cranberry sauce
• Roasted vegetables

A Southern sweet potato casserole is particularly popular alongside a traditional holiday spread, where its sweet and creamy flavor balances savory meats and sides.

Storage and Reheating

Store leftover casserole covered in the refrigerator for up to 4 days.

To reheat, cover with foil and warm in a 350°F oven until heated through. Remove the foil during the final few minutes if you want the topping to crisp up again.

Individual portions can also be reheated in the microwave, although the marshmallow topping will be softer.

Frequently Asked Questions

Can I make sweet potato casserole ahead of time?

Yes. Prepare the sweet potato filling up to one day ahead and refrigerate it. Add the marshmallows immediately before baking.

Can I use canned sweet potatoes?

Yes, canned sweet potatoes can work when you need a shortcut. Drain them very well before mashing, and check the label because some canned varieties already contain added sugar or syrup.

Why is my sweet potato casserole watery?

The most common reason is excess moisture from the cooked potatoes. Drain them thoroughly and allow them to steam-dry briefly before mashing.

Can I leave out the marshmallows?

Absolutely. You can use chopped pecans, streusel, or simply bake the sweet potato filling on its own.

Can I freeze sweet potato casserole?

The sweet potato filling can be frozen, but the marshmallow topping is best added fresh. Thaw the filling in the refrigerator before baking and adding the topping.