In a small saucepan, bring the apple cider to a boil over medium-high heat. Reduce heat to low and simmer until it’s reduced to about ¾ cup (approx. 15-20 minutes). Allow to cool slightly.
Preheat your oven to 375°F (190°C) and grease a donut pan with cooking spray or butter.
In a large bowl, whisk together the flour, sugar, baking powder, baking soda, ground cinnamon, nutmeg, and salt.
In a separate medium bowl, beat the eggs. Add the buttermilk, melted butter, and the reduced apple cider to the eggs and mix until well combined.
Pour the wet ingredients into the dry ingredients and stir gently until just combined. Do not overmix; a few lumps are acceptable.
Using a piping bag or a spoon, fill each cavity of the donut pan about ¾ full with the batter.
Bake in the preheated oven for 10-12 minutes or until the donuts are lightly golden and a toothpick inserted comes out clean.
Allow the donuts to cool in the pan for 5 minutes, then transfer them to a wire rack. While they are still warm, combine the granulated sugar and ground cinnamon in a shallow bowl and roll the donuts in the mixture until fully coated.
Enjoy your freshly made apple cider donuts warm or at room temperature.
Notes
Serve the donuts on a wooden board sprinkled with powdered sugar and garnish with sliced fresh apples and a small bowl of extra cinnamon sugar for dipping.