Reduce the Apple Cider:

• In a medium saucepan, simmer apple cider over medium heat for about 5 minutes, or until reduced to ½ cup.
• Let it cool slightly before adding to the batter.

Make the Donut Batter:

• Preheat the oven to 375°F (190°C) and grease a donut pan.
• In a large bowl, whisk together flour, granulated sugar, baking powder, cinnamon, nutmeg, and salt.
• In another bowl, whisk eggs, melted butter, vanilla extract, and reduced apple cider until smooth.
• Add the wet ingredients to the dry ingredients and mix until just combined (do not overmix).

Bake the Donuts:

• Spoon the batter into the donut pan, filling each cavity about ¾ full.
• Bake for 12–15 minutes, or until golden brown and a toothpick inserted comes out clean.

Coat the Donuts in Cinnamon Sugar:

• In a shallow bowl, mix brown sugar and cinnamon.
• Once the donuts have cooled slightly, roll them in the cinnamon sugar mixture until fully coated.

Optional: Make the Apple Cider Glaze:

• In a small bowl, whisk together powdered sugar, apple cider, and cinnamon until smooth.
• Dip the cooled donuts into the glaze, letting any excess drip off before serving.