Heat oven to 350°. Place cream cheese in a deep baking dish and stir until smooth. Mix in buttermilk ranch dressing, sauce and cheeses. Stir in chicken. Bake for 15 to 20 minutes or until the dip is completely heated throughout; be careful not to overcook. Stir again and serve with crackers, tortilla chips or vegetables. For tasty variations, add one or more of the following: southwest seasoned chicken and salsa, canned tuna, cooked diced shrimp, cooked lump crabmeat, cooked diced lobster, cooked ground beef, cooked diced bacon, diced celery, or chopped green onion.