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Preheat your oven to 400°F.
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Saute the onion, celery, carrots and potatoes in margarine for 10 minutes. Add the flour to the sauteed mixture, stirring well, cook one minute stirring constantly.
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Combine the broth and half and half. Gradually stir into the vegetable mixture. Cook over medium heat stirring constantly until thickened and bubbly.
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Stir in the salt and pepper; add the chicken and stir well. Pour into shallow 2 quart casserole dish and top with pie shells.
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Cut slits to allow steam to escape.
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Bake for 40-50 minutes or until the pastry is golden brown and the filling is bubbly and cooked through.