Ingredients:
- 225g (1 cup) unsalted butter, softened, plus extra for greasing the pans
- 170g (6 ounces) high-quality white chocolate, chopped
- 225g (1 cup plus 2 tablespoons) granulated sugar
- 2 large eggs
- 1 teaspoon vanilla extract
- 280g (2 1/4 cups) all-purpose flour
- 1 1/2 teaspoons baking powder
- 1/4 teaspoon salt
- 240ml (1 cup) milk
- 60ml (1/4 cup) vegetable oil
- 225g (1 cup) unsalted butter, softened
- 450g (4 cups) powdered sugar, sifted
- 170g (6 ounces) high-quality white chocolate, melted and cooled slightly
- 3-4 tablespoons milk or heavy cream
- 1 teaspoon vanilla extract
Instructions:
- Preheat oven to 350°F (175°C). Grease and flour the cake pans. Line the bottoms with parchment paper rounds.
- Combine white chocolate and butter in a microwave safe bowl. Melt, stirring occasionally, until smooth. Let cool slightly but not solidify.
- In a large bowl, cream together the softened butter and sugar until light and fluffy.
- Beat in the eggs one at a time, then stir in the vanilla extract.
- In a separate bowl, whisk together the flour, baking powder, and salt.
- Gradually add the dry ingredients to the wet ingredients, alternating with the milk and oil, beginning and ending with the dry ingredients. Mix until just combined. Don't overmix!
- Gently fold the cooled white chocolate and butter mixture into the batter until evenly distributed.
- Divide the batter evenly between the prepared cake pans. Bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean.
- Let the cakes cool in the pans for 10 minutes before inverting them onto a wire rack to cool completely.
- In a large bowl, beat the softened butter until smooth and creamy. Gradually beat in the powdered sugar until combined.
- Beat in the melted and cooled white chocolate, vanilla extract, and enough milk or cream to reach a smooth, spreadable consistency.
- Once the cakes are completely cool, level them with a serrated knife if necessary. Place one cake layer on a serving plate, top with frosting. Add the second cake layer and frost the entire cake.
- Chill the frosted cake for at least 30 minutes to allow the frosting to set. (Optional, but helps with clean slicing).