To make the pasta sauce, melt butter in the same skillet and scrape up any browned bits left over from cooking the sausage and shrimp. Cook peppers, celery, onions, and garlic until vegetables are soft. McGlynn says this takes about five minutes. Add tomato paste, mix and simmer for 3-5 minutes. If it starts sticking to the pan, pour in some white wine to deglaze the pan.
Boil the wine until the pan is dry again, about 5 minutes, and pour in the chicken broth. When the soup begins to boil, add the cream cheese and stir until melted. Add whipped cream, cajun seasoning, and parmesan cheese and mix.