Preheat the Air Fryer to 315 degrees.
In a small bowl, lightly whisk the egg and milk. Put it aside.
Mix the butter and cinnamon until thoroughly combined. Set this mixture aside.
Take the dough and separate it into 8 triangles. Put two teaspoons of the butter mixture and spread it all over.
Starting from the wide end, gently wrap the dough around the butter mixture and roll to the opposite point.
Spray the air fryer basket with non-stick baking spray. Brush on the egg wash and put the crescent rolls in the basket, leaving some space between them so they're not touching.
Cook for 7-8 minutes or until they're fully cooked.
Take the crescents out of the air fryer and enjoy!