In a large bowl, combine the cooked spaghetti, shredded chicken, cream of chicken soup, diced tomatoes and green chilies, Velveeta cheese, and chicken broth.
Mix well until all ingredients are combined and the cheese is starting to melt.
Pour the mixture into a greased 9x13 inch baking dish.
Bake for 20-25 minutes, or until bubbly and heated through.
Let cool slightly before serving.
Notes
Optional: Top with shredded cheddar cheese during the last 5 minutes of baking.