In a large bowl combine the cake mix, butter, milk, eggs, and apple cider.
Using a hand mixer (or whisk by hand) beat for 2 minutes, scraping down the sides halfway through, until batter is light and thoroughly combined.
Add the mixture to a large piping bag. Clip off the end of the bag where you have a larger opening for the thick batter to come out. (Alternatively, you could just spoon the mixture into your donut pan instead of piping) A Ziploc bag works well if you don’t have a piping bag.
Pipe the donut batter into a greased donut pan. If you don’t have a donut pan, you can just make little circles onto a greased cookie sheet. That will work, too!
Bake for 10-12 minutes in a 325-degree oven – when the dough springs back when touched, they are done.
Allow to cool on a wire rack for about 5 minutes. and then dip the entire donut into melted butter and then into cinnamon and sugar mixture. Tap off excess and add to the wire rack.