Sweet Potato Casserole with Marshmallow

Stay with me, because I’m walking you through the version that never sits on the table for long. It is simple, steady, and has earned its place at Thanksgiving in my house and many others. If you prefer to take sweet potatoes in a more savory direction, a sweet potato hash brown bake is another hearty way to bring them to the table. Once you try it, you may not want to hand the sweet-potato-casserole job to anyone else again.

Is it better to Boil or Bake?

I have tried every kind of sweet potato casserole you can imagine. The “lightened up” ones, the trendy versions without marshmallows, the ones that claim to take only five minutes. They always sound clever, but they never feel like the dish I grew up expecting on the table. This one does. The potatoes turn smooth and rich without becoming watery, and the topping bakes into a crisp layer that actually holds its crunch even after resting. The secret to this is to boil the sweet potato and ensure they are drained very well, remove any excess water by leaving the potatoes on a paper towel.

And here’s something I learned the hard way: rushing never pays off. When I first started making this, I mixed everything while the potatoes were still steaming hot and the streusel (the crumbly filling) always sank. Once I slowed down and let each step happen at its own pace, the result changed completely. The pecans toast naturally in the oven, the butter settles into the potatoes instead of sitting on top, and the marshmallows soften just enough without disappearing. It is not reinvented or reimagined, just made the way it should be. That is why this version always wins on my holiday table.

Plus, it’s super simple to make ahead, making it your secret weapon for stress-free holidays. If you love heartwarming sides like Mashed Potatoes, Homemade Buttery Herb Stuffing, or Golden Baked Mac And Cheese, this one’s about to join your must-make list.

What ingredients go in?

This casserole is straightforward, but nothing in it is an afterthought. It is the kind of dish people quietly scoop an extra spoonful of.

• Sweet Potatoes: I use Beauregard sweet potatoes, they are the ones with a reddish-orange skin and deep orange flesh, these give you a buttery and moist texture.
• Brown Sugar: It deepens the flavor and adds that gentle sweetness people always expect from this casserole, without making it heavy.
• Pecans: They toast as the casserole bakes, giving a crisp finish and a nutty bite that balances the soft potato base. No soft or soggy topping here.
• Marshmallows: They slowly melt and soften on top, creating a light, golden layer that feels classic and nostalgic in the best way.

Note: Find the full list of ingredients and measurements in the Recipe Card.

• Cook the Sweet Potatoes Boil the peeled and chopped sweet potatoes until soft and tender, then drain them very well to remove as much water as you can and let them cool slightly.
• Mash Until Smooth In a large bowl, mash the sweet potatoes with butter, brown sugar, salt, allspice, and eggs until creamy and smooth.
• Make the Streusel Topping Mix melted butter, brown sugar, flour, and cinnamon until crumbly. Stir in the chopped pecans for that signature crunch.
• Assemble the Casserole Spread the sweet potato mixture into a 9×13 inch (23cm x 33cm) baking dish, sprinkle the streusel topping evenly, and top with fluffy marshmallows.
• Bake Until Golden Bake until the topping is crisp and the marshmallows are lightly melted and toasted to perfection.
• Serve Warm Let it cool just enough to set, then serve while the topping is still gooey and irresistible.

This casserole may be called a “side dish,” but it easily steals the show. It pairs beautifully with savory mains like Herb-Roasted Turkey, Maple Glazed Ham, or Garlic Lemon Roast Chicken. the sweet, buttery layers perfectly balance all that salt and spice.

For a full holiday spread, serve it alongside Creamy & Crispy Green Bean Casserole to keep that classic thanksgiving feeling on your table. And if you’re lucky enough to have leftovers, it tastes just as good reheated the next morning (yes, even for breakfast).

Can I Make Sweet Potato Casserole Ahead Of Time?

Yes! You can prepare the sweet potato mixture and the topping a day in advance. Keep them separate in the fridge and assemble just before baking.

Can I Use Canned Sweet Potatoes?

You can just make sure to drain them well and skip the boiling step. Fresh potatoes will give a creamier texture, but canned ones work in a pinch.

How Do I Keep The Marshmallows From Burning?

Bake the casserole uncovered until the topping is golden. If the marshmallows brown too quickly, loosely cover the dish with foil for the last few minutes.

Can I Make It Without Marshmallows?

Absolutely. The pecan streusel alone gives a delicious crunch and caramel flavor if you prefer to keep it less sweet.

Sweet Potato Mixture

Streusel Topping & Marshmallow

• Assemble, Transfer the sweet potato mixture into a 9×13 inch (23cm x 33xm) baking dish and spread evenly. Sprinkle the pecan topping evenly over the surface, then top with the marshmallows.