Preheat the oven to 350 degrees.
Pour apple cider into a saucepan and bring it to a boil. Once boiling, reduce the heat so that it continues to simmer. Leave it on a simmer for ~30 minutes, or until the cider has reduced to a quarter its volume (¾ cup). Remove from heat and allow it to cool.
Pour all of the dry ingredients into a medium-large mixing bowl (or a stand mixer)(flour, baking soda, baking powder, salt, cinnamon, nutmeg, brown sugar and sugar). Lightly whisk the ingredients together.
Add oil, milk, egg and vanilla. Mix the ingredients until combined.
Add the apple cider and mix until combined.
Thoroughly grease your donut pan.
Use a spoon or a piping bag to pour the batter into the donut pan, filling each cavity ~¾ full.
Bake them for 15-20 minutes, or until the edges and bottom have browned.