Preheat the air fryer to 330°F for 3 minutes.
Lightly spray the air fryer basket with nonstick cooking spray, or add air fryer-safe parchment with holes.
Chop the apple pie filling into small pieces.
Stir the chopped apple pie filling with 1 teaspoon ground cinnamon and 1 tablespoon brown sugar, if using.
Separate the 8 refrigerated biscuits.
Flatten each biscuit into a 4-inch round.
Spoon about 1 tablespoon of filling into each dough round.
Pull the dough edges over the filling.
Pinch the seams tightly until sealed.
Place each apple pie bomb seam-side down in the air fryer basket.
Brush the tops with melted butter.
Air fry at 330°F for 7 to 9 minutes.
Turn them once if your air fryer browns unevenly.
Brush the apple pie bombs again with butter while warm.
Mix 1/4 cup granulated sugar with 1 teaspoon ground cinnamon in a small bowl.
Roll or sprinkle the warm apple pie bombs with the cinnamon sugar coating.
For the optional glaze, whisk 1/2 cup powdered sugar with 1 to 2 teaspoons milk.
Add 1/4 teaspoon vanilla to the glaze, if using.
Drizzle the glaze over the apple pie bombs only after they cool slightly.
Let the apple pie bombs cool for 5 minutes before serving.