Step 1
Preheat oven to 375�. Melt butter in a large skillet over medium heat; add leeks, and saut� 3 minutes. Sprinkle with flour; cook, stirring constantly, 3 minutes. Whisk in chicken broth; bring to a boil, whisking constantly. Remove from heat; stir in chicken and next 5 ingredients (note you can skip the veggies and replace with more chicken).
Step 2
Roll each pastry sheet into a 12- x 10-inch rectangle on a lightly floured surface. Fit 1 sheet into a 9-inch deep-dish pie plate; spoon chicken mixture into pastry. Place remaining pastry sheet over filling in opposite direction of bottom sheet; fold edges under, and press with tines of a fork, sealing to bottom crust. Whisk together egg and 1 Tbsp. water, and brush over top of pie (you can use/add evaporated milk to brush).
Step 3
Bake at 375� on lower oven rack 55 to 60 minutes or until browned. Let stand 15 minutes.
Step 4
Melt butter in a large skillet over medium-high heat. Whisk in flour, and cook, whisking constantly, 1 minute. Whisk in broth and remaining ingredients. Cook over medium heat, whisking constantly, 2 minutes or until mixture thickens.
Step 5
Slice pie and top with gravy.
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