Cut biscuits into 4ths. In a bowl combine the sugar and cinnamon, toss biscuit pieces in this mixture so they're nice and coated.
Spray inside of air fryer pan with non stick spray, lay down a layer of nuts.
Add coated biscuits, topped with more nuts.
In a small bowl combine melted butter and brown sugar. Stir together and spoon over biscuits.
Preheat air fryer to 330 degrees F for 5 minutes. Put pan inside and cook for 10 minutes.
Then carefully lift out pan and cover with foil. Continue cooking for 15 minutes or until the middle biscuits in pan are no longer sticky.
For icing mix together powdered sugar and milk until smooth. Put plate over top of pan and carefully flip over so monkey bread slides out. Pour icing over the top and serve.