In a medium saucepan, add 24 ounces of tomato sauce, 14½ ounce can of Italian stewed tomatoes, 1 chopped tomato, 1 small package mushrooms (optional), 2 teaspoons Italian seasoning, and 1 teaspoon sugar. Heat until mixture begins to bubble.
Remove meat from cold chicken and shred.
Add the chicken to the tomato sauce and cook for 1 hour on low heat stirring occasionally or until the chicken softens and has soaked up some of the liquid.
Serve over pasta or oven toasted garlic bread.
Top with 2 cups shredded mozzarella and freshly cut basil.