In large stock pot, heat butter over low heat until melted. Take pan off stove and blend in flour using a wisk. Return to stove and add onion, salt and pepper. Cook over low heat, stirring constantly, until mixture is smooth and bubbly; remove from heat. Stir in broth and milk (or gravy). Heat to boiling; stirring constantly. Boil and stir approx. 1 minute. Stir in chicken and vegetables.
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