Preheat oven to 450°F (230°C). Have ready an ungreased 8-inch (20 cm) square baking pan.
Place peas and carrots in a small bowl and pour in enough boiling water to cover them. Let stand about 3 minutes. Drain well.
On a lightly floured surface, roll pastry into a square slightly larger than the baking pan. Cover pastry with waxed paper while preparing filling.
In a large saucepan over medium-high heat, melt butter. Stir in flour and curry powder. Gradually stir in broth. Continue cooking and stirring until mixture boils and thickens. Stir in vegetables and mushrooms. Add chicken, stirring as little as possible to avoid breaking pieces. Transfer to baking pan.
Cover with pastry, folding edges under. Make 3 or 4 slashes in surface to allow steam to escape. Bake for about 25 minutes or until pastry is golden and filling is hot and bubbly.
Makes 4 - 6 servings.
Filling may be prepared ahead and refrigerated. When ready to bake, make pastry and proceed as directed. Increase baking time to about 35 minutes.
When doubling this recipe, make in 9 x 13-inch (22 x 34 cm) pan; bake about 50 minutes.
* Or instead of broth use 2 1/2 cups (625 mL) concentrated, seasoned homemade broth, or the same amount of water with 2 tbsp. (25 mL) chicken bouillon base.
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