3 1/2 cups cake flour
1 teaspoon baking powder
1/4 teaspoon baking soda
1 1/2 teaspoons salt
3/4 teaspoon ground cinnamon
1/4 teaspoon freshly grated nutmeg
3/4 cup granulated sugar
3/4 cup buttermilk
3 tablespoons unsalted butter, melted and cooled
1 large egg, at room temperature
2 teaspoons vanilla extract
vegetable oil for frying
1 cup confectioners' sugar, sifted