1. Prep the air fryer. Preheat the air fryer to 340 degrees F and spray the basket with non-stick baking spray. 
2. Prepare the biscuits. Cut a hole in the center of each biscuit and arrange them in a single layer in the basket of the air fryer. Brush the biscuits with butter. 

NOTE: It is important not to crowd the air fryer here. So you might have to air fry the biscuit dough in batches. Spray with non-stick spray between each batch. 

1. Air fry the biscuits. Air fry the biscuits for 6 minutes. 
2. Make the icing. Transfer each color of icing to its own microwave safe bowl and heat, one at a time, for 30 seconds in the microwave. Whisk 1 tablespoon whole milk into each icing to thin it out.
3. Ice the donuts. Dip the top of each donut in the color/s of your choosing. Arrange them on a cooling rack and set aside until the icing stops dripping but is still a bit soft. 
4. Decorate. Decorate each donut with the eyes and the small tubes of icing. I like making faces and spider webs on mine but get as creative as you’d like to. Alternate eye sizes and use random patterns in the icing as facial features. You can press the vampire teeth into the center of the donuts to create a mouth and then add red icing on the fangs.