Remove the biscuit dough from the can and place it on a cutting board. Slice the dough into eight equal pieces. Using a rolling pin, flatten each piece of dough.
Cut a hole in a center of each dough circle.
Spray the air fryer basket with oil. Air fry donuts at 350°F for 2-3 minutes on each side or until they turn golden brown.
Cinnamon Sugar
In a shallow bowl, combine the cinnamon and sugar. Stir and set aside.
Brush each donut with melted butter. Dip each donut into the cinnamon-sugar mixture until coated. Enjoy!
Glaze
In a shallow bowl, combine the powdered sugar, milk, and vanilla extract. Whisk until the glaze is perfectly smooth.
Coat each donut with the glaze. Optional: Top with sprinkles.