Simmer the apple cider in a sauce pot over medium-low heat until the liquid is reduced to about ½ cup of liquid (15 to 20 minutes). You can add aromatics, like cinnamon sticks, orange slices, or whole cloves, if desired to intensify the flavor. Transfer to a small bowl or cup and refrigerate while you prepare the remaining ingredients.
Preheat the oven to 350°F. Lightly mist a donut tray with cooking spray.
In a large bowl, combine the flours, baking soda, baking powder, cinnamon, and salt. Mix together with a fork.
In a medium bowl, whisk together melted butter, brown sugar, almond milk, lemon juice, applesauce, vanilla, and ½ cup reduced apple cider.
Pour the wet ingredients into the dry ingredients and mix together. You'll want to be careful not to over-mix, but you want the flour mixture to be fully incorporated into the wet batter.
Spoon the batter into the donut trays or use a piping bag to pipe the batter into the tray for cleaner, more uniform donuts. Bake 12 to 15 minutes, or until a toothpick inserted into the thickest portion of the donut comes out clean. Cool on an oven rack for 10 minutes. Re-coat the donut tin with cooking spray and repeat these steps for remaining batter, if you were not able to cook all the donuts in one batch.
Melt the 1½ tablespoons of butter. Combine the sugar and cinnamon in a shallow plate or bowl and mix to combine. Brush the donuts with the butter and dip into the cinnamon sugar, shaking off excess sugar. Repeat for all donuts. Enjoy!