Prepare the apple filling: In a medium saucepan, melt the butter over medium heat. Add the diced apples, brown sugar, cinnamon, and cornstarch (if using). Stir to combine. Cook for 4-5 minutes, until the apples soften and the mixture thickens. Remove from heat and let it cool for a few minutes.

1. Assemble the apple pie bombs: Open the can of biscuit dough and separate the biscuits. If using crescent roll dough, unroll the dough and separate into individual triangles. Flatten each biscuit or triangle slightly to make a small round or square shape. Place a spoonful of the apple filling in the center of each dough piece. Fold the edges of the dough over the filling to form a ball (or bring the edges of the crescent roll triangles together to form a pocket). Pinch the edges together to seal the bombs.
2. Coat the apple pie bombs: In a small bowl, mix together the granulated sugar and cinnamon. Brush each apple pie bomb with melted butter and roll them in the cinnamon-sugar mixture to coat them evenly.
3. Air fry the apple pie bombs: Preheat the air fryer to 350°F (175°C) for 3-5 minutes. Arrange the prepared apple pie bombs in a single layer in the air fryer basket. Air fry at 350°F (175°C) for 8-10 minutes, or until golden brown and crispy on the outside. Check halfway through and give them a little shake to ensure even cooking.
4. Serve and enjoy: Let the apple pie bombs cool for a few minutes before serving. They are delicious on their own or with a drizzle of caramel sauce or a scoop of vanilla ice cream!