Cook and shred the chicken, if necessary.
Cook the pasta as directed. Drain.
In a large mixing bowl, mix together the diced tomatoes and green chilies (with the juices), sour cream, ground cumin, chili powder and salt. Stir until smooth, then stir in the shredded cheddar cheese.
Pour the warm, drained pasta noodles into the bowl with the cheesy mixture and toss until cheese melts into the pasta. If need be, return the pasta and sauce to saucepan to heat through.
Stir in the shredded chicken.
Serve King Ranch Mac n Cheese with side salad.
To Freeze: Place the prepared pasta and chicken into disposable foil baking tray and cover with foil. Thaw and reheat at 350 for 30 minutes.