Prepare Filling: Core and dice one apple into small pieces. Combine in a small saucepan with sugar, cornstarch, and cinnamon. Pour in water and lemon juice. Cook over medium heat, stirring occasionally until apple softens and mixture thickens.

Prepare Apples: Remove the tops of the remaining two apples. Using a spoon, carefully hollow out the centers, leaving thick walls to hold the filling. Fill each apple with the cooked mixture.

Create Crust: On a lightly floured surface, roll out pie crust. Cut into thin strips. Weave strips over the tops of the filled apples to create a lattice pattern.

Cook: Brush lattice with beaten egg and dust with additional cinnamon sugar if desired. Air fry at 350°F / 176°C for 14 minutes, or until crust is golden brown and apples are tender.

Finish: Allow to cool for 5 minutes. For extra indulgence, drizzle warm caramel sauce over the top before serving.