Make a white sauce by melting butter and adding flour. Stir for 1-2 minutes but don't let it burn. Add milk and stir while it thickens. Add 1/2 can of broth, seasoning, chicken, vegetables, and hard boiled eggs if you are using them.
Roll out 1 pie crust and place in a 9" pie pan. Put chicken mixture in pan. Roll out second pie crust and place on top of pie. Pierce with a fork and brush with beaten egg. Bake at 350° until crust is brown and filling is bubbly.