Preheat the oven to 425°F (220°C). Place one pie crust in a 9-inch pie plate and press it firmly against the sides and bottom.n2. In a large bowl, mix the apple pie filling with cinnamon and lemon juice. Pour the filling into the crust-lined pie plate.n3. Top the pie with the second pie crust. Pinch the edges together to seal and cut a few slits in the top crust for venting.n4. Optional: Brush the crust with the beaten egg mixed with water for a shiny finish.n5. Bake for 40 to 45 minutes or until the crust is golden brown.n6. Cool for at least 2 hours before slicing to allow the filling to set. Serve with ice cream if desired.