• Heat oven to 220 C. Prepare pie crusts using 9-inch glass pie pan.
• In 2-quart saucepan, melt butter over medium heat. Add onion; cook 2 minutes, stirring frequently, until tender. Stir in flour, salt and pepper until well blended. Gradually stir in broth and milk, cooking and stirring until bubbly and thickened.
• Stir in chicken and mixed vegetables. Remove from heat. Spoon chicken mixture into crust-lined pan. Top with second crust; seal edge and flute. Cut slits in several places in top crust.
• Bake 30 to 40 minutes or until crust is golden brown. During last 15 to 20 minutes of baking, cover crust edge with strips of foil to prevent excessive browning. Let stand 5 minutes before serving.

Pie Crust

• To make the dough for the pie crust, mix 2 1/2 cups all-purpose flour and 1 teaspoon each salt and sugar in a medium-size bowl. Cut 2 sticks chilled unsalted butter into pieces. With a pastry blender, cut in butter, working until mixture resembles coarse meal.
• Add 4 tablespoons ice water; work with hands until dough comes together. If dough is still crumbly, add more ice water a tablespoon at a time (up to 4 more tablespoons). Do not overwork.
• Divide dough in half, and flatten halves into disks. Wrap disks separately in plastic; refrigerate at least 1 hour.
• To form the pie shell, roll the dough on a floured surface into a 14-inch round. Wrap around rolling pin and carefully unroll over a 9-inch pie plate.
• Fit gently into bottom and side of plate. Use kitchen shears to trim dough to a 1-inch overhang; fold under, and seal to form a rim.
• Crimp rim with fingertips and knuckle. Repeat with remaining dough; wrap each with plastic, stack, and freeze.