Preheat the oven to 350°F (175°C) and grease the donut pan.

In a large mixing bowl, whisk together the dry ingredients: flour, sugar, baking powder, baking soda, cinnamon, nutmeg, and salt.

In another bowl, mix the wet ingredients: eggs, melted butter, vanilla extract, and reduced apple cider.

Combine the wet ingredients with the dry ingredients and stir until just combined.

Spoon the batter into the prepared donut pan, filling each cavity about 2/3 full.

Bake for 12-15 minutes, or until a toothpick inserted into the center comes out clean.

Allow the donuts to cool in the pan for 5 minutes before transferring to a cooling rack.

In a small bowl, mix together the sugar and cinnamon for the topping.

While the donuts are still warm, coat them in the cinnamon sugar mixture.