Sweet potato casserole sits somewhere between a side dish and a dessert, which is the point. This version leans toward savory-sweet. The potatoes are roasted instead of boiled, which concentrates the flavor, and the pecan streusel on top adds crunch.
It’s one of the best make-ahead dishes for a holiday table. You can prepare it up to two days before baking.
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About this dish
Silky, lightly spiced sweet potato under a crisp, buttery pecan streusel. It’s sweet, but the salt and cinnamon keep it balanced, and the contrast between the creamy base and the crunchy top is the whole point.
Serve it with turkey, ham or roast chicken. It can also pass for a very good dessert-adjacent side.
Prep 20 min · Cook 1 hour 40 min, including roasting · Serves 8
Ingredients
Sweet potato filling
- 3 lb (1.4 kg) sweet potatoes, about 4 large
- 4 tbsp (55 g) unsalted butter, melted
- 1/3 cup (65 g) light brown sugar
- 1/3 cup (80 ml) whole milk
- 2 large eggs
- 1 tsp vanilla extract
- 1 tsp ground cinnamon
- 1/4 tsp ground nutmeg
- 1/2 tsp salt
Pecan streusel
- 1/2 cup (60 g) all-purpose flour
- 1/2 cup (100 g) light brown sugar
- 4 tbsp (55 g) cold unsalted butter, cubed
- 1 cup (110 g) chopped pecans
- Pinch of salt
Method
- Heat the oven to 400°F (200°C). Prick the sweet potatoes a few times with a fork, place them on a lined baking sheet and roast for 50 to 60 minutes, until very soft and leaking syrup. Cool for 15 minutes.
- Lower the oven to 350°F (175°C) and butter a 2-quart baking dish.
- Peel the potatoes and mash the flesh in a large bowl until smooth. Beat in the melted butter, brown sugar, milk, eggs, vanilla, cinnamon, nutmeg and salt. Taste and adjust. It should be sweet but not cloying.
- Spread the mixture in the dish.
- For the streusel, rub the cold butter into the flour, sugar and salt with your fingertips until coarse crumbs form. Mix in the pecans and scatter evenly over the top.
- Bake for 30 to 35 minutes, until the center is set and the topping is deep golden. Let it rest for 10 minutes before serving.
Tips
- Roast, don’t boil. Boiled sweet potatoes absorb water and give a looser, blander casserole.
- Cold butter in the streusel gives a crisper topping. Don’t melt it.
- If your potatoes are very wet after roasting, let them sit in a colander for a few minutes before mashing.
- Toast the pecans for 5 minutes in the oven first for a deeper flavor.
Make ahead
Assemble the filling in the baking dish, cover and refrigerate for up to 2 days. Keep the streusel in a separate container. When ready, add the streusel and bake, allowing an extra 10 minutes if the dish is cold.
Leftovers
Keeps for 4 days in the fridge. Reheat covered in a 325°F oven for 20 minutes, then uncover for the last 5 to crisp the top.
Variations
- Marshmallow topping: skip the streusel and add a layer of mini marshmallows for the last 10 minutes of baking.
- Add 1 tbsp of bourbon or the zest of an orange to the filling.
- For a savory side, skip the sugar and cinnamon, and add thyme, garlic and a little smoked paprika.
The story behind the dish
Sweet potatoes originated in Central and South America and were cultivated there for thousands of years before spreading across the world. They became a staple of Southern cooking in the United States, where they were a dependable, nourishing crop.
The sweet casserole served at Thanksgiving is a more recent tradition. The marshmallow-topped version is often traced to the early 20th century, when marshmallow manufacturers published recipes to help sell their product. One of the earliest examples cited is a 1917 promotional booklet. The pecan streusel is a more recent riff, but it works for the same reason: sweet, soft potato needs something crunchy on top.
Sweet potatoes are not related to yams, despite the common mix-up in American supermarkets. True yams are a different plant, native to Africa and Asia, while sweet potatoes come from the Americas. One common explanation for the mix-up is that enslaved Africans, who knew true yams, applied that word to the sweet potato they found in the American South.
