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Easy Purple Birthday Cake


  • Author: clara
  • Total Time: 45 minutes
  • Yield: 12 servings 1x
  • Diet: Vegetarian

Description

A vibrant cake made with purple sweet potatoes or blueberries, offering a unique flavor and texture that delights guests.


Ingredients

Scale
  • 1 cup purple sweet potatoes or blueberries
  • 2 cups all-purpose flour
  • 1 cup unsalted butter
  • 1.5 cups granulated sugar
  • 2 teaspoons baking powder
  • 1 teaspoon baking soda
  • 4 large eggs
  • 1 cup milk or dairy-free alternative
  • 2 teaspoons vanilla extract

Instructions

  1. Preheat your oven to 350°F (175°C) and grease two 9-inch round cake pans.
  2. Prepare the purple sweet potatoes or blueberries: peel and boil the sweet potatoes until tender, then mash them. Alternatively, blend blueberries to create a puree.
  3. Cream the butter and sugar together in a large bowl until light and fluffy (about 3-5 minutes).
  4. Add the eggs, one at a time, mixing thoroughly after each addition.
  5. Mix in the purple sweet potato or blueberry puree, milk, and vanilla extract until fully combined.
  6. In another bowl, whisk together the flour, baking powder, baking soda, and a pinch of salt. Gradually fold into the wet mixture until just combined.
  7. Distribute the batter evenly between the prepared pans.
  8. Bake for 25-30 minutes, or until a toothpick comes out clean.
  9. Cool in the pans for 10 minutes before transferring to a wire rack to cool completely.
  10. Frost with cream cheese frosting or whipped cream.

Notes

For a dairy-free version, substitute butter with coconut oil. For gluten-free, use almond flour.

  • Prep Time: 15 minutes
  • Cook Time: 30 minutes
  • Category: Dessert
  • Method: Baking
  • Cuisine: American

Nutrition

  • Serving Size: 1 slice
  • Calories: 320
  • Sugar: 22g
  • Sodium: 180mg
  • Fat: 14g
  • Saturated Fat: 8g
  • Unsaturated Fat: 4g
  • Trans Fat: 0g
  • Carbohydrates: 42g
  • Fiber: 2g
  • Protein: 4g
  • Cholesterol: 90mg

Keywords: purple cake, birthday cake, sweet potatoes, blueberries, party dessert