Marshmallow-topped sweet potato casserole has a place of honor on the Thanksgiving table (at least since the mid-twentieth century), but that doesn’t mean it has to be overcooked, overdosed with spices, and overly sweet. This simple version, topped with a traditional layer of browned marshmallows, is lightly sweetened, with sweet potatoes that end up tender, not mushy. And instead of the usual cloud of pumpkin pie spices, it’s flavored simply with just a hint of ginger (we prefer the spiciness of candied or crystallized ginger, but ground ginger works just fine).
Make-ahead note: Prepare through step 4 up to 1 day ahead (skip the heating of the oven). Cool the casserole completely, cover it with foil, and refrigerate. When ready to serve, reheat covered in a 350°F oven until warmed through, about 30 minutes. Uncover and continue with the last step.
- Yield: 6 to 8 servings
- Difficulty: Easy
- Total: 1 hr
- Active: 50 mins
- 6 tablespoons unsalted butter (3/4 stick)
- 1/2 cup packed dark brown sugar
- 1/2 cup water
- 1 tablespoon kosher salt
- 1 teaspoon ground ginger or 1/4 cup finely chopped candied or crystallized ginger
- 4 pounds Garnet sweet potatoes, peeled and cut into 1-inch cubes
- 4 cups mini marshmallows
- Heat the oven to broil and arrange a rack in the lower third.
- Melt the butter in a large pot or Dutch oven with a tightfitting lid over medium-high heat until foaming. Add the brown sugar, water, salt, and ground ginger (if you’re using candied or crystallized ginger, it will be added later). Cook, stirring occasionally, until the mixture comes to a boil.
- Add the sweet potatoes, stir to combine, and return to a boil. Reduce the heat to medium low, cover, and simmer, stirring every few minutes, until the sweet potatoes are knife tender and starting to fall apart at the edges, about 20 to 25 minutes.
- Add the candied or crystallized ginger, if using, and stir until evenly combined. Transfer the sweet potatoes and any liquid to a 13-by-9-inch baking dish and spread into an even layer.
- Sprinkle the marshmallows evenly over the sweet potatoes. Broil until the marshmallows are puffed and golden brown, about 1 to 1 1/2 minutes. Place the dish on a wire rack and let cool for 10 minutes before serving.