for the cake 2 cups all - purpose flour 1 teaspoon baking
powder 1 teaspoon baking soda 1 stick plus 1 Tablespoon (9 Tablespoons) soft, unsalted butter 3/4 cup super
fine (caster) sugar 2 eggs 1 cup sour cream 1 - 2 teaspoons confectioner's sugar for dusting
flavorless oil for greasing pan (or baking spray)