Preheat oven to 350°F (175°C) and grease a donut pan.
In a small saucepan, simmer the apple cider over medium heat until it reduces to about 1/2 cup. Set aside to cool.
In a large bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, allspice, clove, and salt.
In another bowl, beat together the granulated sugar, brown sugar, eggs, melted butter, vanilla extract, and cooled apple cider reduction.
Add the wet ingredients to the dry ingredients and stir until just combined. Do not overmix.
Stir in the milk until the batter is smooth.
Fill the donut pan cavities about 3/4 full with batter.
Bake for 10-12 minutes or until a toothpick inserted into the center of a donut comes out clean.
Allow the donuts to cool in the pan for about 5 minutes, then transfer to a wire rack.
While warm, roll the donuts in cinnamon sugar mixture until coated.