To a large saucepan, add the apples, water, both kinds of sugar, lemon juice, vanilla cinnamon and nutmeg and bring to a low boil.
Allow the apple mixture to cook for 8-10 minutes.
Mix together the 3 TBSP of water and 3 TBSP of cornstarch then add to the apple mixture.
Stir together and add the mixture to thicken and then cool for 15-20 minutes.
While the mixture is cooling, Preheat the oven to 375 degrees and grease a pie dish with non-stick spray.
Take one of the pieces of pie dough and lay across the pie dish. Carefully press down and secure around the edges leaving about an inch hanging over the side. Prick the dough in several spots using a fork.
Pour in the filling mixture and make sure it is evenly spread.
Take the second piece of pie dough and slice it into 10 even strips.
Create a lattice design by laying 5 pieces across the pie. Lift two pieces and then lay one piece the opposite direction underneath the two top pieces. Lift the remaining three pieces and add another piece the opposite direction. Repeat the process.Optional- if you choose not to create a lattice design you can lay the second piece of pie crust across the top of the pie. Cut off any excess dough, then using your fingers or a fork, crimp the edges of the dough to seal. Brush the pie dough with an egg white and water mixture.
Bake the pie on the bottom rack for 35 minutes.
Allow the pot pie to cool for 10 minutes before serving.