Chicken pie

In large saucepan, bring chicken stock, wine, carrots, celery, potato, bay leaf, salt and pepper to boil; cover, reduce heat and simmer for 10 minutes. Add chicken; simmer, uncovered, until no longer pink inside, 10 minutes. Skim off any foam. Strain; set aside 2 1/2 cups (625 mL) stock, adding water or chicken stock if necessary. Set aside chicken mixture; discard bay leaf.

In saucepan, melt butter over medium heat. Whisk in flour; cook, whisking constantly, for 2 minutes. Whisk in reserved stock until smooth. Bring to boil; cook, stirring, until thickened, about 5 minutes. Stir in cream; cook for 2 minutes. Add chicken mixture; stir to coat. (Make-ahead: Transfer to bowl; let cool. Cover and refrigerate for up to 1 day. Reheat.) Add peas; transfer to 8-cup (2 L) oval casserole dish.

On floured surface, roll out pastry to fit top of dish plus 1-inch (2.5 cm) extra all around; trim edges. Brush edge of dish with water. Centre pastry over filling; gently press overhang to adhere to dish. Brush with egg; slash 4 steam vents. Bake in 400°F (200°C) oven until golden, puffed and filling is bubbly, about 30 minutes.