In a saucepan, combine frozen veggies and celery. Add water to cover and boil for 15 minutes. Remove from heat, drain and set aside. Add chicken.
In another saucepan over medium heat, cook onions in butter until soft. Stir in flour, salt, pepper and celery seed. Slowly stir in chicken broth and milk. Simmer over medium-low heat until thick. Remove from heat and set aside.
Form one pie crust onto the bottom of a casserole dish or pie pan. Place the chicken mixture in the bottom of the crust. Top with sauce mixture. Put pie crust on the top and fold down the sides and cut slits across.
Bake is 425 degree oven for 30 to 35 minutes. Let cool about ten minutes.
So let's just hope that Chris doesn't get sick again for a very long time. But if he does, let's hope I can be a little more sympathetic and be prepared with Kleenex, a good comfort meal and a warm fire.