In a small bowl, whisk together the egg and milk or water to make the egg wash.
Brush the top of the pie with the egg wash. Sprinkle granulated sugar over the top for a slightly crunchy and sweet crust.
Cut a few slits on the top crust to allow steam to escape during baking.
Place the pie on a baking sheet (to catch any drips) and bake in the preheated oven for 45-50 minutes, or until the crust is golden brown and the apple filling is bubbly.
Remove the pie from the oven and let it cool on a wire rack for at least 2 hours before serving. This allows the filling to set and the flavors to intensify.
Enjoy your delicious homemade apple pie served warm or at room temperature, with a scoop of vanilla ice cream or a dollop of whipped cream on top!
