Sweet potato souffle is a tender, lightly sweet casserole made with mashed sweet potatoes, eggs, butter, and a crisp brown sugar-pecan topping. Once the potatoes are cooked, bake it for 30–35 minutes at 375°F (190°C), until the center is set and the topping is golden.
Ingredients
- 2 lb (900 g) sweet potatoes, peeled and cut into 1-inch (2.5 cm) pieces
- 8 cups (1.9 L) water, for boiling the potatoes
- ½ cup (113 g) unsalted butter, divided
- ⅓ cup (80 ml) whole milk
- ⅓ cup (67 g) packed light brown sugar, divided
- 2 large eggs (about 100 g without shells), lightly beaten
- 1 tsp (5 ml) vanilla extract
- ½ tsp (3 g) fine salt
- ½ tsp (1.3 g) ground cinnamon
- ⅓ cup (40 g) all-purpose flour
- ½ cup (55 g) chopped pecans
Instructions
- Preheat and prepare the dish. Heat the oven to 375°F (190°C). Lightly butter a 2-quart (1.9 L) baking dish, such as an 8-by-11-inch dish. Set out the eggs and milk while you prepare the potatoes; ingredients that are not very cold are easier to mix evenly into the mash.
- Boil the sweet potatoes. Put the peeled, cut potatoes in a large saucepan and add the water. Bring to a boil over high heat, then reduce the heat enough to maintain a steady simmer. Cook for 15–18 minutes, until a fork slides through the largest pieces without resistance. Cut the pieces to a similar size so they finish at roughly the same time.
- Drain and let them cool briefly. Drain the potatoes thoroughly in a colander, then leave them there for 10 minutes. This short pause lets steam escape. Excess water can make the filling loose and delay setting, so do not skip draining or return the potatoes to the pan full of water.
- Make the filling. Transfer the warm potatoes to a large bowl and mash until smooth, or leave a few small lumps if you prefer a more rustic texture. Melt 5 tablespoons (70 g) of the butter and stir it into the potatoes with the milk, ¼ cup (50 g) of the brown sugar, vanilla, salt, and cinnamon. When the mixture is warm rather than piping hot, mix in the beaten eggs until evenly incorporated. Adding eggs to very hot potatoes can cause them to begin scrambling.
- Spread the mixture in the dish. Spoon the filling into the prepared baking dish and smooth the top into an even layer. A level surface helps the casserole bake at a consistent rate. If you are preparing the topping before the filling is ready, keep the topping ingredients separate until you are ready to scatter them.
- Mix and add the topping. In a small bowl, combine the flour, chopped pecans, and remaining ¼ cup (17 g) brown sugar. Cut in the remaining 3 tablespoons (43 g) butter with a fork or your fingertips until the mixture forms small, crumbly clumps. Scatter it evenly over the sweet potato filling rather than pressing it down; loose crumbs brown better.
- Bake for 30–35 minutes. Place the dish on the middle oven rack and bake until the topping is golden and the edges are bubbling gently. The center should look set, not wet or fluid, and should have only a slight jiggle when the dish is nudged. Because this is an egg dish, USDA FSIS guidance sets 160°F (71°C) as the safe minimum internal temperature; check the center with a food thermometer, avoiding contact with the baking dish. If the topping browns before the center reaches temperature, loosely cover it with foil and continue baking.
- Rest before serving. Set the dish on a heat-safe surface and let it stand for 10 minutes. The filling firms as it rests, so servings hold together better than they would straight from the oven. Serve warm, scooping down through the crunchy topping and soft filling.
Tips
- Use a thermometer and the visual cues together. Ovens and baking dishes vary, so begin checking at 30 minutes rather than relying on the clock alone. The center should reach 160°F (71°C), while the top should look toasted but not scorched. A glass or ceramic dish may heat differently from a metal one, and a deeper dish can need longer than a shallow dish.
- Keep the filling thick. Drain the potatoes well, and measure the milk rather than pouring it in by eye. If the mash seems unusually wet, give the drained potatoes an extra minute or two in the warm saucepan over low heat, stirring gently to let moisture evaporate before mashing.
- Make sensible substitutions. For a dairy-free version, use an unsweetened oat or soy milk and plant-based butter in equal amounts; the flavor may be a little less rich. Walnuts can replace pecans, though their flavor is more assertive. For a nut-free topping, leave out the pecans and use an extra 2 tablespoons (15 g) flour and 1 tablespoon (12 g) brown sugar for a simple crumble.
- Choose the texture you like. A hand masher makes a pleasantly dense, casserole-style souffle. A hand mixer can make the filling smoother, but mix only until combined after adding the eggs. Overmixing can make the texture gluey, and this recipe is not intended to rise like a classic soufflé made with whipped egg whites.
Serving Suggestions
Serve sweet potato souffle warm as a side dish with roast turkey, baked ham, or a simple roast chicken. Its sweetness and crunchy topping pair especially well with savory vegetables such as green beans, Brussels sprouts, or sautéed greens. For a weeknight meal, a scoop alongside lentils or roasted vegetables makes the casserole part of a meat-free plate.
The recipe is sweet enough to feel special but not as sugary as a dessert. If serving it with other sweet sides, keep the rest of the meal more savory. For a holiday table, bake it in the same dish you plan to serve from, and give it the full 10-minute rest so the first portion does not collapse into a soft pile. A small garnish of chopped parsley is optional, but it is not needed for flavor or presentation.
Variations
Marshmallow top: Omit the flour, pecans, and brown sugar topping. Bake the filling for about 25 minutes, then add 2 cups (about 100 g) mini marshmallows and return the dish to the oven for 5–8 minutes, until puffed and lightly browned. Watch closely near the end because marshmallows can darken quickly.
Less-sweet version: Reduce the brown sugar in the filling to 2 tablespoons (25 g), and keep the topping as written or reduce its sugar to 2 tablespoons (25 g). The sweet potatoes still provide a naturally sweet flavor, and the topping remains crisp. Taste the mashed potatoes before adding the eggs if you want to adjust the seasoning.
Warm spice variation: Replace the cinnamon with ¼ teaspoon (0.5 g) ground nutmeg, or add ¼ teaspoon (0.5 g) ground ginger alongside it. These spices make the flavor warmer without changing the cooking time. Avoid adding a large amount of liquid flavoring, which can loosen the filling.
Make it ahead: Prepare and bake the casserole up to one day in advance, cool it, cover, and refrigerate. Reheat covered until hot through, then uncover for the final few minutes to refresh the topping. For the best crunch, you can also mix the topping a day ahead and keep it in a separate covered container in the refrigerator, sprinkling it on just before baking.
Storage and Reheating
Do not leave the casserole at room temperature for more than 2 hours. Cool leftovers promptly, transfer them to a shallow airtight container or cover the baking dish, and refrigerate. They keep for 3–4 days. The pecan topping softens in the refrigerator, but the flavor remains pleasant; reheating uncovered can restore some of its crispness.
For individual servings, microwave in short intervals until steaming hot throughout, turning or stirring where practical for even heating. To warm a larger portion, cover the dish with foil and heat in a 325°F (165°C) oven until hot in the middle, then uncover briefly if you want to crisp the topping. USDA FSIS recommends reheating leftovers to 165°F (74°C); check the center with a food thermometer. Add a small pat of butter only if the filling seems dry.
To freeze, cool the baked casserole, wrap it well, and freeze for up to 2 months for best quality. Thaw overnight in the refrigerator before reheating; the texture may be slightly softer after freezing, and the topping will not be as crisp. Refrigerate any thawed leftovers and use them within the usual 3–4-day refrigerated window.
Frequently Asked Questions
How long does sweet potato souffle take to bake?
For this recipe, bake it for 30–35 minutes at 375°F (190°C) after boiling and mashing the sweet potatoes. It is ready when the center is set, the topping is golden, and a thermometer reads 160°F (71°C) in the center. A deeper dish or a cool filling can add a few minutes, so use the doneness checks rather than removing it at an exact minute.
Can I bake it with raw sweet potatoes?
This recipe cooks the potatoes before they go into the baking dish. Raw sweet potato pieces would not soften evenly during the casserole’s short baking time, and they would leave the eggs and topping exposed to a much longer bake. If you want to roast the potatoes instead of boiling them, bake whole potatoes at 400°F (204°C) until completely tender, then scoop out the flesh and proceed with the recipe; that adds roughly 45–60 minutes depending on their size.
Why is my sweet potato souffle runny?
The most common reasons are potatoes that were not drained well, too much milk, or a casserole removed before the center set. Let boiled potatoes steam-dry in the colander, measure the milk, and check the middle with a thermometer. The filling also firms during its 10-minute rest, so allow that time before judging the final texture.
Can I assemble sweet potato souffle the night before?
Yes. You can assemble the filling in the baking dish, cover it, and refrigerate it overnight. Keep the pecan topping in a separate container and add it just before baking so it stays crumbly. Since the filling starts cold, it may need several extra minutes in the oven; check for a set center and 160°F (71°C) rather than relying on the standard bake time.
Should sweet potato souffle rise?
This casserole-style version may puff slightly around the edges, but it is not expected to rise dramatically or hold a tall shape. Its eggs bind the mashed potatoes, while the pecan crumble provides contrast. A true soufflé uses whipped egg whites for lift and is more delicate, so it follows a different method and should be served soon after baking.
Can I use canned sweet potatoes?
You can use canned sweet potatoes if they are plain and unsweetened. Drain them very thoroughly and measure out about 4 cups (900 g) of drained potatoes to replace the cooked fresh potatoes. Canned potatoes are softer and can contain more moisture, so omit any syrup, reduce the milk slightly if the mash is loose, and check the center for doneness as directed.
Related
- Salmon Kitchen Recipes: Lemon-Garlic Skillet Salmon
- RumChata Hot Chocolate Recipe for a Creamy Mug
- Sangria Spritz Recipe: A Bright, Bubbly Party Drink
More recipes to cook
Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
Spotted an error? Tell us and we will correct it (corrections policy).