This 4-ingredient sweet potato casserole is the kind of easy holiday side dish that earns a permanent place on the table. It comes together with just a handful of pantry and produce staples, but it still has that cozy, nostalgic flavor people expect at Thanksgiving, Christmas, and Sunday family dinners. The sweet potatoes bake up soft and creamy, and the marshmallow topping turns golden and gooey in the oven, making it especially popular with kids and anyone who loves a classic comfort-food side.
Serve this casserole alongside roast turkey, baked ham, pork loin, or even a simple roast chicken dinner. It fits right in with green beans, stuffing, cranberry sauce, and buttery dinner rolls, and it also works nicely at a potluck because it can be made ahead and warmed before serving. For a sweeter holiday plate, it pairs especially well with savory mains and simple vegetable sides.
4-Ingredient Sweet Potato Casserole
Servings: 8
Ingredients
4 medium sweet potatoes, peeled and cut into chunks
1/2 cup brown sugar
4 tablespoons butter, melted
2 cups mini marshmallows
Directions
1. Preheat the oven to 375°F and lightly grease a rectangular glass baking dish. Place the sweet potato chunks in a large pot, cover with water, and boil until fork-tender, about 15 to 20 minutes.
2. Drain the sweet potatoes well, then mash them until smooth. Stir in the brown sugar and melted butter until the mixture is creamy and evenly combined.
3. Spread the sweet potato mixture into the prepared baking dish and smooth the top. Sprinkle the mini marshmallows evenly over the surface.
4. Bake for 20 to 25 minutes, until the casserole is heated through and the marshmallows are puffed and golden brown. Let it rest for 5 minutes before serving.
Variations & Tips
For extra sweetness: If your family likes a dessert-like casserole, add a little more brown sugar before baking. You can also save a small handful of marshmallows to scatter on top during the last 5 minutes for an extra fluffy finish.
For a smoother texture: Mash the sweet potatoes very well or use a hand mixer for a silkier filling. This is a nice trick if you are serving little ones or anyone who prefers a softer, creamier casserole.
Make-ahead tip: Prepare the sweet potato mixture and spread it into the baking dish a day ahead, then cover and refrigerate. Add the marshmallows right before baking so they stay fresh and toast up nicely.
Picky eater tip: If someone at the table is unsure about marshmallows, leave one corner plain before topping the rest. That way everyone can scoop out the version they like best without making a second dish.