Add the apple cider to a saucepan and bring to a boil - keep on a rolling boil until it has reduced to about 1 cup volume (approx 10 minutes). Set aside to cool.
Preheat the oven to 375℉/190℃. Line a 12 hole muffin pan.
In a large bowl, gently whisk together the flour, white sugar, light brown sugar, baking powder, baking soda, ginger and cinnamon.
To this bowl, add the reduced apple cider, melted butter, eggs and milk - use a wooden spoon/spatula to bring together. Electric mixers will make the muffin batter too dense.
Spoon the batter into the lined muffin pan, filling each case to about 2/3 full.
Bake 15-16 minutes, until golden on top.