Cook pasta in salted water according to package directions; drain.
Cook cubed cheese, sour cream, and milk over medium-low heat, stirring constantly, 5 minutes or until cheese melts. Stir in pasta and chicken, and cook until thoroughly heated.
For Spicy Cheesy Chicken Penne: Substitute 2 (8-ounce) loaves pasteurized prepared cheese product with peppers for prepared cheese product.
This is sooo easy and yummy! I use smoked rotisserie chicken and it gives this such a wonderful flavor.