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add tomatoes, celery, carrots, chicken broth, onions, oregano, basil, and bay leaf to a large slow cooker. Cover and cook on LOW for 5 to 7 hours, until flavors are blended and vegetables are soft. About 30 minutes before serving prepare a roux. Melt butter over low heat in a skillet and add flour. Stir constantly with a whisk for 5 to 7 minutes. Slowly stir in 1 cup hot soup. Add another 3 cups and stir until smooth. Add all back into the slow cooker. Stir and add the Parmesan cheese, warmed half and half, salt and pepper. Add additional basil and oregano if needed Cover and cook on LOW for another 30 minutes or so until ready to serve.
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