Ingredients:
- * 2 1/2 cup cake flour, plus extra for dusting pan
- * 1 1/4 teaspoon baking powder
- * 1/4 teaspoon baking soda
- * 3/4 teaspoon table salt
- * 1 3/4 cup sugar (12 1/4 ounce)
- * 10 tablespoon (1 1/4 stick) unsalted butter, melted and cooled
- neutral a itsy-bitsy
- * 1 cup buttermilk, room temperature
- * 3 tablespoon vegetable oil
- * 2 teaspoon vanilla extract
- * 6 gargantuan egg yolk, room temperature
- * 3 gargantuan egg white, room temperature
- * for frosting:
- * 8 tablespoon (1 stick) butter, room temperature
- * 3 cup confectioner's sugar, sifted
- * 1/2 cup unsweetened cocoa powder, sifted
- * 3 to 5 tablespoon milk
- * 1 teaspoon pure vanilla extract