01 -
In a small saucepan over high heat, bring the apple cider to a boil for 1 minute, then lower to a simmer and reduce to 1/2 cup, about 10–15 minutes. Cool completely before use.
02 -
Preheat oven to 375°F (190°C). Generously coat a donut pan with nonstick baking spray containing flour.
03 -
In a large mixing bowl, whisk together cake flour, baking powder, ground cinnamon, salt, and ground nutmeg until evenly combined. Set aside.
04 -
In a separate bowl, whisk together reduced apple cider, whole milk, brown sugar, granulated sugar, egg, melted butter, and vanilla extract.
05 -
Pour the liquid ingredients into the dry mixture and stir gently until just combined, taking care not to overmix.
06 -
Transfer batter to a large zip-top bag, snip a 1/2 inch opening from a bottom corner, and pipe batter into donut pan, filling each cavity halfway.
07 -
Bake for 8–10 minutes, or until a toothpick inserted into the center emerges clean. Cool in the pan briefly, then transfer to a wire rack.
08 -
Mix granulated sugar and cinnamon in a shallow bowl. Brush each donut with melted butter, then dip and roll to coat thoroughly in cinnamon sugar.
09 -
Arrange donuts on a platter and serve at room temperature.