Ingredients For the Best-Ever Buttermilk Cake layers: 3 cups (345 g) cake flour 2 cups (410 g) superfine sugar 1 tablespoon plus 1 teaspoon baking powder 3/4 teaspoon salt 3/4 cup plus 2 tablespoons (200 g) cold unsalted butter, cut into pieces 2 tablespoons (30 ml) vegetable oil 1 1/4 cups (300 ml) buttermilk, room…