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Grandma’s Famous Sweet Potato Butter Cake is the kind of dessert that instantly brings back memories of family gatherings, holiday dinners, church socials, and Sunday afternoons spent around the kitchen table. Rich with buttery flavor, infused with naturally sweet mashed sweet potatoes, and baked to moist perfection, this cake is a treasured Southern classic that has stood the test of time.
For generations, Southern bakers have relied on sweet potatoes to create comforting desserts that are both flavorful and satisfying. While sweet potato pie often gets most of the attention, Sweet Potato Butter Cake deserves its place among the South’s greatest desserts. Combining the velvety texture of sweet potatoes with rich butter, warm spices, and a tender cake crumb creates a dessert that’s truly unforgettable.
What makes this cake special is its incredible moisture. Sweet potatoes naturally contribute richness and softness, while butter adds a luxurious flavor that melts in your mouth. Every slice delivers hints of cinnamon, nutmeg, vanilla, and brown sugar, making it especially popular during Thanksgiving, Christmas, Easter, and family celebrations.
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This cake is versatile enough to serve as a casual everyday dessert yet elegant enough for special occasions. Topped with a buttery glaze, cream cheese frosting, or simply dusted with powdered sugar, Grandma’s Famous Sweet Potato Butter Cake is guaranteed to become a family favorite.
Whether you’re carrying on a family tradition or discovering this Southern gem for the first time, this recipe delivers warmth, comfort, and homemade goodness in every bite.
Ingredients
🍠 For the Sweet Potato Butter Cake
3 cups all-purpose flour
1 teaspoon baking powder
½ teaspoon baking soda
½ teaspoon salt
1 teaspoon ground cinnamon
½ teaspoon ground nutmeg
¼ teaspoon ground ginger
1 cup unsalted butter, softened
2 cups granulated sugar
½ cup brown sugar
5 large eggs
1½ cups mashed sweet potatoes
1 cup buttermilk
2 teaspoons vanilla extract
🧈 For the Butter Glaze
½ cup unsalted butter
1 cup granulated sugar
¼ cup water
1 teaspoon vanilla extract
Optional Garnishes
Chopped pecans
Toasted walnuts
Powdered sugar
Cinnamon sprinkle
Whipped cream
Preparation
Step 1: Prepare the Sweet Potatoes
Wash and peel sweet potatoes.
Boil until fork-tender, approximately 20 minutes.
Drain completely and mash until smooth.
Allow them to cool before adding to the batter.
For the best flavor, use freshly cooked sweet potatoes rather than canned.
Step 2: Prepare the Pan and Oven
Preheat oven to 325°F (163°C).
Grease and flour a 10-inch Bundt pan or tube pan thoroughly.
Make sure every surface is coated to prevent sticking.
Step 3: Mix the Dry Ingredients
In a medium bowl, whisk together:
Flour
Baking powder
Baking soda
Salt
Cinnamon
Nutmeg
Ginger
Set aside.
These spices give the cake its classic Southern flavor profile.
Step 4: Prepare the Batter
In a large mixing bowl, beat butter until creamy.
Gradually add granulated sugar and brown sugar.
Continue mixing for 4–5 minutes until light and fluffy.
Add eggs one at a time, mixing well after each addition.
Mix in:
Mashed sweet potatoes
Vanilla extract
Alternate adding the flour mixture and buttermilk.
Begin and end with the flour mixture.
Mix only until combined.
Do not overmix.
Step 5: Bake the Cake
Pour the batter into the prepared pan.
Smooth the top evenly.
Bake for 75–85 minutes, or until a toothpick inserted into the center comes out clean.
Allow the cake to cool in the pan for 15 minutes before removing.
Transfer to a wire rack.
Variation
1. Sweet Potato Pecan Butter Cake
Fold 1 cup chopped pecans into the batter.
2. Cream Cheese Sweet Potato Cake
Add 8 ounces softened cream cheese to the batter.
3. Brown Butter Sweet Potato Cake
Use browned butter instead of regular butter for a nutty flavor.
4. Maple Sweet Potato Cake
Replace some sugar with pure maple syrup.
5. Sweet Potato Coconut Cake
Add 1 cup shredded coconut.
6. Sweet Potato Rum Cake
Add 2 tablespoons dark rum for a holiday version.
COOKING Note
Fresh sweet potatoes provide the best flavor.
Measure mashed sweet potatoes accurately.
Avoid overmixing once flour is added.
Room-temperature ingredients create a smoother batter.
Allow the cake to cool before glazing.
Check for doneness using a toothpick near the center.
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