Preheat your air fryer to 350°F.
Remove the biscuits from the can and separate them. Use a small round cutter or bottle cap to punch a hole in the center of each to make donut shapes.
Lightly spray the air fryer basket with cooking spray.
Place the donuts in the basket, making sure they don’t touch. Air fry for 5-6 minutes or until golden brown, flipping halfway through.
While the donuts are cooking, combine the sugar and cinnamon in a shallow bowl.
Once the donuts are done, brush them with melted butter and immediately toss them in the cinnamon-sugar mixture.
Serve warm and enjoy!