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Grandma’s Famous Sweet Potato Butter Cake

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A tender, buttery dessert that blends roasted sweet potato with subtle spice, featuring a moist crumb and a glossy glaze.

  • Total Time: 70 minutes
  • Yield: 12 servings 1x

Ingredients

Scale
  • 1 cup (2 sticks) unsalted butter, softened
  • 1½ cups granulated sugar
  • 4 large eggs
  • 1 cup mashed sweet potatoes (about 1 large cooked and peeled sweet potato)
  • ½ cup sour cream (room temperature)
  • ¼ cup milk (whole or 2%)
  • 2 teaspoons vanilla extract
  • 2 cups all-purpose flour
  • 2 teaspoons baking powder
  • ½ teaspoon baking soda
  • ½ teaspoon salt
  • 1 teaspoon ground cinnamon
  • ¼ teaspoon ground nutmeg
  • Optional Glaze: 4 tablespoons (½ stick) unsalted butter, melted, ½ cup powdered sugar, 1–2 tablespoons milk, ½ teaspoon vanilla extract

Instructions

  1. Preheat oven to 350°F (175°C). Grease and flour a 9×13-inch baking dish or bundt pan.
  2. In a large bowl, beat softened butter and sugar together until light and fluffy, about 2–3 minutes. Scrape sides as needed.
  3. Add eggs one at a time, mixing well after each addition.
  4. Stir in mashed sweet potatoes, sour cream, milk, and vanilla extract until smooth.
  5. In a separate bowl, whisk together flour, baking powder, baking soda, salt, cinnamon, and nutmeg.
  6. Gradually add dry ingredients to wet ingredients, stirring gently until just combined. Avoid overmixing.
  7. Pour batter into prepared pan and smooth top with a spatula.
  8. Bake in a 9×13-inch pan for 40–45 minutes or in a bundt pan for 50–60 minutes, until a toothpick inserted in the center comes out clean.
  9. Let cake cool in pan for 15 minutes, then transfer to wire rack to cool completely.
  10. For the glaze (optional), melt butter in a small saucepan. Whisk in powdered sugar, milk, and vanilla extract until smooth. Drizzle over cooled cake.
  11. Slice and serve.

Notes

Use well-puréed sweet potato for even texture. Optional glaze enhances presentation without overshadowing the cake’s flavors.

  • Prep Time: 20 minutes
  • Cook Time: 50 minutes
  • Category: Dessert
  • Method: Baking
  • Cuisine: American
  • Diet: Vegetarian

Nutrition

  • Serving Size: 1 slice
  • Calories: 350
  • Sugar: 22g
  • Sodium: 200mg
  • Fat: 18g
  • Saturated Fat: 10g
  • Unsaturated Fat: 8g
  • Trans Fat: 0g
  • Carbohydrates: 42g
  • Fiber: 2g
  • Protein: 4g
  • Cholesterol: 70mg