Cut a hole in the center of each biscuit using a piping tip meant for a frosting bag.
Place the donuts in a single layer in the air fryer basket.
Air fry the donuts at 350 degrees F for 6 - 7 minutes, or until they are puffed and cooked through.
Meanwhile, heat the butter in a microwave safe shallow bowl until melted.
Put the sugars and cinnamon into a gallon-sized zippered bag, seal and shake until well blended.
Dip each donut into the melted butter, making sure all sides are coated.
After dipping each donut into the melted butter, place the donuts in the bag with the sugar and cinnamon mixture.
Close the bag and shake, making sure the donuts are evenly covered with the sugar mixture. Serve immediately.