|Preheat oven to 375 degrees F. Put bottom crust in 10" pie plate or 9x9" pan. |
In a medium saucepan, melt butter; add onion and cook until tender.
Stir in flour, salt and pepper; cook for 1 minute.
Add chicken broth and milk; cook until thick.
Add chicken and vegetables, stirring to combine. Put in prepared pan. Top with remaining pastry crust. Bake for 40 minutes until golden brown and bubbly.