Sweet Potato Casserole with Marshmallows Recipe

This Sweet Potato Casserole with Marshmallows Recipe is the Thanksgiving side dish that disappears first every single year. Creamy mashed sweet potatoes, whipped with butter, brown sugar, cinnamon, and a splash of vanilla, bake under a thick blanket of marshmallows that turn golden and gooey in the oven. It is part side dish, part dessert, and completely irresistible next to roast turkey and gravy.

For more holiday favourites, try our Roasted Garlic Mashed Potatoes, our Herb Roasted Turkey Breast with Garlic Butter and our Classic Pumpkin Pie.

What Makes This Sweet Potato Casserole with Marshmallows So Good

The magic is in the contrast. Underneath, the sweet potatoes are silky and rich, sweetened just enough to taste like a treat without turning into dessert. On top, the marshmallows puff up and toast to a deep golden brown, giving every spoonful a little crunch, a little chew, and a lot of drama when the dish comes out of the oven.

It is also one of the easiest dishes on the holiday table. The base comes together in one bowl, it can be assembled a day ahead, and it bakes happily alongside the turkey while you finish everything else. For a cook juggling ten dishes at once, that kind of reliability is worth its weight in gold.

The Key Ingredients

A short list of pantry staples is all this classic needs.

The Sweet Potatoes

Fresh sweet potatoes, boiled until tender and mashed smooth, give the best flavor and texture. Canned sweet potato puree works in a pinch, but fresh potatoes roast up sweeter and lighter. About three pounds is right for a dish that serves eight generously.

The Sweet Spices

Brown sugar, cinnamon, and a pinch of nutmeg bring the warm holiday flavor, while a spoonful of vanilla rounds everything out. A little salt is essential too, because it keeps the sweetness from tasting flat and one dimensional.

The Marshmallow Topping

Mini marshmallows melt and toast more evenly than large ones, covering the surface in a golden blanket with no bare patches. A handful of chopped pecans scattered over the top adds crunch and a toasty, buttery note that balances the sweetness.

How to Make Sweet Potato Casserole with Marshmallows

The method is simple: mash, mix, top, and bake.

• Boil the sweet potatoes: peel, cube, and boil in salted water for 15 to 20 minutes until very tender, then drain well.
• Mash until smooth: mash with butter, brown sugar, milk, vanilla, cinnamon, and nutmeg until creamy.
• Spread in the dish: spoon the mixture into a buttered baking dish and smooth the top.
• Add the topping: cover with mini marshmallows and a sprinkle of chopped pecans.
• Bake until golden: bake at 375 degrees for 20 to 25 minutes until the marshmallows are puffed and toasted.

Mistakes to Avoid

Watery Sweet Potatoes

If the boiled potatoes are not drained well, the casserole turns soupy. Drain them thoroughly and let them steam dry in the colander for a few minutes before mashing.

Over-Sweetening the Base

The marshmallows add plenty of sweetness on top, so keep the base gently sweet. Taste the mashed potatoes before baking and adjust the sugar rather than guessing.

Burning the Marshmallows

Marshmallows go from golden to burnt in under a minute. Watch the dish closely during the last five minutes of baking and pull it out as soon as the tops are evenly toasted.

What to Serve with Sweet Potato Casserole with Marshmallows

This is a classic Thanksgiving side, and it loves the rest of the holiday table:

• Roast turkey and gravy, the classic pairing
• Green bean casserole, for a savory contrast
• Cranberry sauce, for a tart, bright bite
• Buttery dinner rolls, for mopping up the plate

Make It Your Own

The recipe welcomes tweaks. Swap the marshmallow topping for a brown sugar and pecan streusel if you prefer crunch to goo, or use half marshmallows and half streusel for the best of both. A spoonful of bourbon or maple syrup in the base adds depth, and a pinch of cayenne gives a gentle warmth that surprises people in the best way. For a dairy free version, use coconut milk and plant based butter.

Make This Sweet Potato Casserole with Marshmallows Today

Sweet, creamy, and crowned with golden marshmallows, this is the side dish your Thanksgiving table has been missing. Boil the potatoes and bake it tonight. Browse more of our Dinner recipes for more holiday sides.