Sweet Potato Casserole
Mashed sweet potatoes seasoned with warm spices and brown sugar, crowned with a toasted marshmallow topping and a crunchy pecan-streusel. The Thanksgiving side that doubles as dessert.

Prep time
15 min
Cook time
30 min
Total time
About 45 min
Yield
Serves 8 (9x9 baking dish)
Ingredients
- 3 lb sweet potatoes (about 5–6 medium), peeled and cubed
- 1/2 cup (1 stick) unsalted butter, melted, divided
- 1/3 cup brown sugar (light or dark)
- 1/4 cup whole milk or heavy cream
- 2 large eggs, beaten
- 1 tsp vanilla extract
- 1 tsp ground cinnamon
- 1/2 tsp freshly grated nutmeg
- 1/2 tsp kosher salt
- Topping: 1 cup mini marshmallows
- Topping: 1/2 cup chopped pecans
- Topping: 1/4 cup flour, 1/4 cup brown sugar, 3 tbsp cold butter, pinch of salt (for the streusel)
About 280 kcal per serving
Instructions
- 1
1. Cook the sweet potatoes
Put the cubed sweet potatoes in a pot, cover with water, add a generous pinch of salt, and bring to a boil. Simmer 15–20 minutes until very tender. Drain well and return to the pot.
- 2
2. Mash and sweeten
Mash the sweet potatoes until smooth. Stir in 6 tbsp of the melted butter, the brown sugar, milk, eggs, vanilla, cinnamon, nutmeg, and salt. Spread the mixture into a buttered 9x9 baking dish and smooth the top.
- 3
3. Make the streusel
In a small bowl, rub the cold butter into the flour, brown sugar, pecans, and a pinch of salt until it looks like coarse crumbs. Scatter the streusel evenly over the sweet potato layer.
- 4
4. Bake, then top with marshmallows
Bake at 375°F (190°C) for 25–30 minutes until the streusel is golden and the edges are bubbling. Scatter the mini marshmallows evenly over the top and bake 5 more minutes, just until they're toasted and gooey. Let it rest 10 minutes before serving.
Chef's notes
- ★Make ahead: assemble through step 2 (without the streusel) up to 1 day ahead, refrigerate, then add the streusel and bake.
- ★Prefer a marshmallow-only top? Skip the streusel and pile on a full bag of mini marshmallows.
- ★For a less sweet version, halve the brown sugar in the sweet potato layer.