Skillet Apple Cake with Cider Reduction

Ingredients

• 1 gallon apple cider
• 1 teaspoon Apple Pie Spice Mix (see recipe below)
• 5 large Granny Smith apples, cored and sliced
• ⅓ cup brown sugar
• 3 tablespoons cider reduction (see recipe below)
• ¼ teaspoon salt
• 2 teaspoons ground nutmeg
• 4 teaspoons ground cinnamon
• 1 teaspoon ground ginger
• 1 teaspoon ground cardamom
• ½ teaspoons ground cloves
• 1 teaspoon ground allspice
• 11/3 cups unbleached all-purpose flour
• ½ cup granulated sugar
• 1½ teaspoons baking powder
• ½ teaspoon salt
• 2/₃ cup warm milk
• 1 large egg, room temperature
• 6 tablespoons butter
• 1 teaspoon vanilla extract
• confectioners sugar, to sprinkle