In a large saucepan, cook beef and sausage over medium heat until no longer pink; drain.
Sprinkle with flour. Stir in the soup, tomatoes, onion and garlic powder. Bring to a boil; cook and stir for 2 minutes or until thickened. Reduce heat. Stir in cheese until melted.
Serve warm with tortilla chips. Refrigerate leftovers.