
1 cup unsalted butter, softened; plus additional for greasing pan
2 cups cake flour, plus additional for flouring pan
1 recipe Chocolate Ganache
2 teaspoons baking powder
½ teaspoon salt
¾ cup granulated sugar
½ cup packed light brown sugar
2 large eggs, at room temperature
4 large egg yolks, at room temperature
⅔ cup buttermilk, at room temperature