01 - Cut the biscuit dough into quarters and roll each piece into a smooth ball.
02 - Lightly brush the surface of each dough ball with apple cider.
03 - Preheat the air fryer to 350°F (175°C). Arrange the dough balls in the basket in batches and air fry for 6 to 8 minutes, shaking halfway through, until golden brown on all sides.
04 - While warm, dip each donut hole in melted butter, then roll in a mixture of cinnamon and sugar until thoroughly coated.