Preheat your oven to 375°F (190°C).
This takes about 10 minutes usually.
Make sure the rack is centered properly.
Melt butter in a large pot first.
Add flour and stir for one minute.
Pour in chicken broth slowly while stirring.
Add milk, soup, and seasonings next.
Stir until the mixture gets thick.
This takes about 5 minutes of cooking.
Put diced chicken into the pot now.
Add frozen vegetables to the mixture too.
Stir everything together very well.
Let it simmer for 3 minutes only.
Remove from heat and set aside.
Place one pie crust in your dish.
Press it down gently along the sides.
Pour the chicken filling over the crust.
Spread it evenly across the bottom.
Place second crust on top carefully.
Seal edges by pressing with a fork.
Cut small slits on top for steam.
Put the pie dish in the oven.
Bake for 35 to 40 minutes total.
The crust should turn golden brown.
Let it cool for 10 minutes.
Then slice and serve it warm.