Creamy Tomato Basil Soup with Parmesan

28 oz. can crushed tomatoes
1 cup finely diced onions
1 cup finely diced carrots
1 cup finely diced celery
¼ cup vegetable oil
4 cups chicken broth
1 tbs. dried basil
1 tsp. dried oregano
1 bay leaf
½ cup flour
½ cup butter
1 cup Parmesan cheese
2 cups half and half
salt and pepper
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