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Add tomatoes, celery, carrots, onions, oregano, basil, chicken broth and bay leaf to a large slow cooker.
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Cover and cook on LOW for 5-7 hours or high for 3-4 hours, until flavors are blended and vegetables are soft. At this point I added all of the vegetables to a blender and blended until smooth. If you have a hand immersion blender that would work great. If you prefer a chunkier texture you can leave it as is or even blend just some of it. Return blended veggies back to the slow cooker.
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About 30 minutes before serving prepare the roux. Melt butter over low heat in a skillet and add the flour. Stir roux constantly with a whisk for 5-7 minutes. Slowly whisk in 1 cup hot soup. Add another 1-2 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.
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Cover and cook on LOW for another 30 minutes or so. You can leave slow cooker on warm until ready to serve. Serve with warm rolls and a green salad. Add a spoonful of orzo to each soup bowl just like they do in the restaurants if desired.