Why is my sweet potato casserole watery?

Almost always the potatoes were boiled and under drained, or canned potatoes went in with their syrup. Roast the potatoes whole so the flesh stays dense, and if you boil or use canned, drain aggressively and steam the cubes dry in the hot pot for 2 minutes before mashing.

Why did the pecan streusel on my sweet potato casserole go soft?

The topping sat on the filling too long before baking, usually overnight in the refrigerator, and absorbed its moisture. Keep the streusel in a separate bowl and scatter it over the sweet potato casserole on baking day only. To revive leftovers, bake at 375°F for 10 minutes.

Can I make sweet potato casserole ahead of time?

Yes, and it improves the holiday. Make the sweet potato casserole filling up to 48 hours ahead and refrigerate it in its dish. Mix the streusel separately and keep it cold. Assemble the topping the day of baking, let the filling lose its chill for an hour, and bake as directed.

Can I freeze sweet potato casserole?

Freeze the sweet potato casserole filling, without streusel, for up to 3 months, wrapped tightly in its dish. Thaw overnight in the refrigerator, add fresh streusel, and bake. Freezing the assembled dish with the topping on softens the streusel, so keep them apart.

Why did the marshmallows burn on my sweet potato casserole?

They went in too early or the dish sat too close to the top element. Add mini marshmallows only in the last 5 minutes of baking, on the middle rack, and watch them continuously: they move from golden to scorched in about 90 seconds.

Sweet Potato Casserole: Ultimate Crunchy Pecan Streusel (10)

Ingredients

Scale

4 large sweet potatoes (about 3 1/2 pounds), for about 4 cups roasted flesh
1/2 cup unsalted butter, melted
1/3 cup packed brown sugar, plus more to taste
1/3 cup heavy cream
2 large eggs, at room temperature
2 teaspoons vanilla extract
3/4 teaspoon fine sea salt
1/2 teaspoon ground cinnamon
Pinch of ground nutmeg
1 cup pecans, toasted and coarsely chopped
1/2 cup all-purpose flour
1/2 cup packed brown sugar (for the streusel)
1/4 teaspoon ground cinnamon (for the streusel)
Pinch of salt (for the streusel)
5 tablespoons cold unsalted butter, cut into small cubes
1 cup mini marshmallows (optional, for half the dish)

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Instructions

Heat the oven to 400°F (200°C). Pierce the sweet potatoes, set them on a foil lined tray, and roast 50 to 60 minutes, until they slump and feel very soft.
Cool slightly, halve, and scoop the flesh into a large bowl. Lower the oven to 350°F (175°C).
Beat the flesh smooth with a hand mixer. Beat in the melted butter, brown sugar, cream, vanilla, salt, cinnamon and nutmeg until glossy.
Let the mixture stand 5 minutes so it is warm, not hot, then beat in the eggs one at a time, just until incorporated.
Spread the filling into a buttered 2 quart baking dish and smooth the top. (The dish can rest, covered, in the refrigerator for up to 48 hours at this point.)
Rub the cold butter cubes into the flour, streusel brown sugar, streusel cinnamon and salt until coarse crumbs form. Fold in the cooled toasted pecans.
Scatter the streusel generously over the filling on baking day.
Bake 30 to 35 minutes, until the edges bubble and the streusel is deeply golden.
If using, scatter the mini marshmallows over one half and bake 5 minutes more, watching closely, until puffed and golden at the tips.
Rest 10 minutes before serving so the filling sets into clean scoops.

Author: Chef Rita
Prep Time: 25 minutes
Cook Time: 35 minutes