Ingredients:

  • 2 1/4 cups (280g) all-purpose flour, sifted
  • 1 teaspoon baking powder
  • 1/2 teaspoon baking soda
  • 1/4 teaspoon salt
  • 1 cup (227g) unsalted butter, softened
  • 1 3/4 cups (350g) granulated sugar
  • 3 large eggs
  • 1 teaspoon vanilla extract
  • 1 cup (240ml) buttermilk
  • 6 ounces (170g) good quality white chocolate, melted and cooled slightly
  • 1 cup (227g) unsalted butter, softened
  • 3 cups (360g) powdered sugar, sifted
  • 4 ounces (113g) good quality white chocolate, melted and cooled slightly
  • 1/4 cup (60ml) heavy cream
  • 1 teaspoon vanilla extract
  • Pinch of salt

Instructions:

  1. Preheat oven to 350°F (175°C). Grease and flour two 9-inch round cake pans. Line the bottoms with parchment paper rounds.
  2. In a medium bowl, whisk together flour, baking powder, baking soda, and salt.
  3. In a large bowl, cream together softened butter and granulated sugar until light and fluffy using an electric mixer.
  4. Beat in eggs one at a time, then stir in vanilla extract.
  5. Gradually beat in the cooled, melted white chocolate. Be careful not to overmix.
  6. Gradually add the dry ingredients to the wet ingredients, alternating with the buttermilk, beginning and ending with the dry ingredients. Mix until just combined. Do not overmix!
  7. Divide batter evenly between the prepared cake pans. Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
  8. Let the cakes cool in the pans for 10 minutes before inverting them onto a wire rack to cool completely.
  9. In a large bowl, beat softened butter until smooth and creamy. Gradually add powdered sugar, beating until light and fluffy.
  10. Beat in the cooled, melted white chocolate, heavy cream, vanilla extract, and salt. Beat until smooth and creamy.
  11. Once the cakes are completely cooled, level them if necessary. Place one cake layer on a serving plate or cake stand. Spread with a generous layer of frosting. Top with the second cake layer.
  12. Frost the entire cake with the remaining frosting. Decorate as desired (sprinkles, chocolate shavings, etc.).
  13. Chill the frosted cake for at least 30 minutes to allow the frosting to set.