Dice chicken into 1/2" cubes.
In a large skillet, grill diced onions until transparent.
Add chicken, water, potatoes, soup, poultry seasoning and peas and carrots.
Stir and cook over medium heat until ingredients are warm (10-15 minutes). If sauce looks too thick, slowly add a little more water until desired consistency is reached.
Remove from heat and allow to cool a little (10 minutes).
Preheat oven to 425.
Heavily grease a 9" pie dish.
Place 1 pie crust in prepared pie dish and use a fork to pierce the crust in several places.
Pour chicken mixture over crust and spread evenly.
Unroll other crust and place over top of chicken mixture and crimp crusts together around edge of dish.
Use a knife to make 4 slits around the top to allow steam to vent.
Brush top with an egg wash.
Bake for 30 minutes. Pull from oven and cover edges with a pie ring or aluminum foil.
Bake for 25-35 minutes or until top is golden brown.