1: Preheat the oven and prepare the cake pans.
2: In a bowl, mix the cake flour, salt, baking powder, and baking soda.
3: In another bowl, cream together the unsalted butter and granulated sugar until light and fluffy.
4: Beat in the eggs and additional egg whites one at a time.
5: Add the vanilla extract and mix well.
6: Gradually add the dry ingredients to the butter mixture, alternating with buttermilk.
7: Pour the batter into the prepared pans and bake until golden.
