Chef John's Apple Fritters
1 large egg 1 tablespoon butter 1 tablespoon melted butter 1 tablespoon sparkling apple cider, or as nee… 1 tablespoon white sugar 1 ¼ cups all-purpose flour 1 ½ teaspoons baking powder 2 cups vegetable oil for frying 2 large Granny Smith apples - peeled, cored a… ¼ cup white sugar ¼ teaspoon ground ginger ½ cup confectioners' sugar, or more as needed ½ cup sparkling apple cider ½ teaspoon ground cinnamon ½ teaspoon kosher salt ⅛ teaspoon ground nutmeg