In a large bowl, combine the chicken, veggies, soup, milk, cheese, green onion, and seasonings. Pour into the frozen pie shell.

Roll out the thawed pie crust sheet and cut into shapes or strips to create a lattice design on top of the pot pie. Lay shapes over the top or weave the strips into any pattern you like. Brush with milk or egg if desired.

Place the pie on a baking sheet to prevent any dripping. Bake at 350°F for 35 minutes or until the crust is golden brown. Serve with extra cheese and green onion if desired.