Preheat the oven to 425°F (220°C).
Let the pie crusts come to room temperature for easier handling.
In a large bowl, combine apples, granulated sugar, brown sugar, flour, cinnamon, nutmeg, salt, and lemon juice. Mix until the apples are well coated.
Roll out one pie crust and place it into a 9-inch pie plate.
Spoon the apple mixture into the crust and dot the top with pieces of butter.
Top with the second pie crust. Seal the edges and cut a few slits in the top to let steam escape.
Brush the top crust with beaten egg for that golden finish.
Bake for 45–50 minutes or until the crust is golden brown and the filling is bubbling.
Let cool on a wire rack for at least 2 hours before serving. Trust me, the filling needs time to settle.