A classic Southern dessert with a flaky pie crust, creamy sweet potato filling, warm spices, and a subtle tang from buttermilk. This homemade pie is smooth, comforting, and perfect for Thanksgiving, family gatherings, or whenever you want a traditional dessert that feels a little extra special.
Buttermilk Sweet Potato Pie combines the natural sweetness of sweet potatoes with butter, cinnamon, nutmeg, and a touch of lemon juice. Buttermilk balances the sweetness, while whipped egg whites help create a lighter, delicate filling.
Why You’ll Love This Recipe
- Rich, creamy filling: Sweet potatoes create a naturally smooth and velvety texture.
- Perfectly balanced flavor: Buttermilk and lemon juice add a gentle tang that complements the sweetness.
- Warm, comforting spices: Cinnamon and nutmeg give every slice a cozy homemade flavor.
- Great for holidays: This pie makes a lovely addition to Thanksgiving, Christmas, and Sunday dinner.
- Easy to prepare ahead: Bake it in advance so dessert is ready when you need it.
Ingredients You’ll Need
Makes one 9-inch pie, serving approximately 8 people.
- 1 refrigerated 9-inch pie crust, prebaked
- 1½ pounds sweet potatoes, peeled and chopped
- 4 tablespoons unsalted butter, melted
- 3 large eggs, separated
- ½ cup granulated sugar
- 2 tablespoons all-purpose flour
- ¾ cup buttermilk
- ½ teaspoon ground cinnamon
- ½ teaspoon freshly grated nutmeg
- 2 tablespoons fresh lemon juice
- ½ teaspoon salt
These quantities follow a traditional buttermilk sweet potato pie preparation, with the egg whites whipped separately for a lighter texture.
How to Make Buttermilk Sweet Potato Pie
Step 1: Cook the Sweet Potatoes
Place the peeled and chopped sweet potatoes in a saucepan or steamer. Cook until they are completely tender when pierced with a fork, about 15–20 minutes, depending on their size.
Drain thoroughly and let them cool slightly. Mash until smooth, removing any lumps for the creamiest filling. Measure approximately 1¼ cups of sweet potato purée for the pie.
Step 2: Prepare the Pie Crust
Preheat your oven to 375°F (190°C). Place the prebaked pie crust in a 9-inch pie dish if it is not already fitted into one.
Make sure the crust has cooled before adding the filling. A prebaked crust helps keep the bottom from becoming soggy.
Step 3: Mix the Sweet Potato Filling
In a large bowl, combine the mashed sweet potatoes with the melted butter, cinnamon, nutmeg, lemon juice, and salt. Stir until the mixture is smooth and evenly seasoned.
In a separate bowl, whisk the egg yolks with the granulated sugar until the mixture becomes creamy and slightly pale.
Add the egg-yolk mixture to the sweet potatoes and mix well. Gradually stir in the flour, followed by the buttermilk, until everything is incorporated.
Step 4: Whip the Egg Whites
In a clean bowl, beat the egg whites until soft peaks form. The whites should hold their shape but still look soft and airy.
Gently fold the whipped egg whites into the sweet potato mixture using a spatula. Avoid stirring too vigorously, as this can deflate the whites and make the filling denser.
Step 5: Fill the Pie Crust
Pour the filling into the prepared pie crust. Spread it evenly with a spatula and gently tap the pie dish on the counter to release any large air bubbles.
Place the pie on a baking sheet to make it easier to transfer to and from the oven.
Step 6: Bake Until Set
Bake for approximately 35–40 minutes, or until the filling is set around the edges and the center no longer looks liquid. The exact baking time may vary depending on your oven and pie dish.
If the crust begins browning too quickly, cover the edges loosely with aluminum foil.
Remove the pie from the oven and place it on a wire rack. Let it cool completely before slicing so the custard has time to firm up.
Tips for the Best Sweet Potato Pie
- Choose naturally sweet potatoes: Orange-fleshed varieties work especially well for a rich color and smooth texture.
- Avoid watery purée: Drain boiled sweet potatoes thoroughly before mashing.
- Make the filling smooth: Mash the potatoes well or use a food processor if needed.
- Fold gently: Incorporate the egg whites carefully to preserve their airy texture.
- Don’t overbake: The filling should be set rather than dry or cracked.
- Cool before cutting: Slicing while the pie is hot can cause the filling to fall apart.
Variations to Try
- Extra cinnamon flavor: Add another ¼ teaspoon of cinnamon for a warmer spice profile.
- Brown sugar version: Replace part of the granulated sugar with light brown sugar for a deeper, molasses-like sweetness.
- Vanilla twist: Add 1 teaspoon of vanilla extract to the filling.
- Pecan topping: Sprinkle chopped toasted pecans over individual slices before serving.
- Gluten-free option: Use a gluten-free pie crust and a suitable gluten-free flour blend in place of all-purpose flour.
What to Serve With Buttermilk Sweet Potato Pie
Whipped cream
A light, creamy topping that complements the spiced filling.
Vanilla ice cream
Serve a scoop alongside a slightly warm slice.
Toasted pecans
Add a crunchy contrast to the smooth custard.
This pie also pairs beautifully with coffee, black tea, or a festive holiday dinner.
Make-Ahead and Storage
Make ahead: Bake the pie a day before serving. Once cooled, cover it and refrigerate until needed.
Refrigeration: Because the filling contains eggs and dairy, store leftovers covered in the refrigerator for 3–4 days.
Freezing: Wrap the completely cooled pie tightly in plastic wrap and then foil. Freeze for up to 2 months for best quality. Thaw overnight in the refrigerator before serving.
Serving: Enjoy chilled or let individual slices sit at room temperature briefly before serving.
Frequently Asked Questions
Can I use canned sweet potatoes?
Yes, provided they are plain sweet potatoes without added syrup or seasoning. Drain them thoroughly and mash until smooth before measuring.
Why add buttermilk to sweet potato pie?
Buttermilk contributes a mild tang that balances the sweetness of the potatoes and sugar. It also helps give the filling its characteristic custard-like texture.
How do I know when the pie is done?
The edges should be set, while the center should have only a slight movement rather than a liquid wobble. The filling will continue to firm as the pie cools.
Can I make this pie without separating the eggs?
You can, but the filling may be denser. Separating the eggs and folding in whipped whites helps create the lighter texture associated with this version of the pie.
Should I refrigerate sweet potato pie?
Yes. Once the pie has cooled, refrigerate it because its custard filling contains eggs and dairy.
Recipe at a Glance
| Detail | Information |
|---|---|
| Prep time | 25 minutes |
| Cook time | 35–40 minutes |
| Total time | About 1 hour 5 minutes, plus cooling |
| Servings | 8 |
| Course | Dessert |
| Cuisine | Southern American |
| Baking temperature | 375°F (190°C) |
Final Thoughts
Buttermilk Sweet Potato Pie is a wonderful way to turn simple ingredients into a comforting homemade dessert. Its smooth sweet potato filling, warming spices, buttery crust, and subtle buttermilk tang make every slice delicious.
Serve it at your next family gathering, prepare it ahead for the holidays, or enjoy a slice with coffee on a quiet afternoon. Once you try this creamy Southern classic, it may become a regular favorite in your dessert rotation.
