1Combine dry crumble ingredients (protein, oat flour, sugars, cinnamon, salt) and mix with wet ingredients (applesauce, butter extract) to form the crumble dough.
2Break dough into small pieces in an air fryer-safe pan and air fry for 1-2 minutes until crunchy.
3Mix apple pie filling with cinnamon and nutmeg in a cast iron skillet.
4Air fry filling at 350° F for a few minutes.
5Top with prepared crumbles and air fry for another 2 minutes.