01 - Set oven temperature to 350°F (180°C).
02 - In a large mixing bowl, blend shredded chicken, softened cream cheese, shredded cheddar cheese, ranch seasoning, and milk until smooth and evenly distributed.
03 - Gently fold in half of the crumbled bacon, reserving the remainder for topping.
04 - Transfer the mixture to a baking dish. Bake uncovered for 20 to 25 minutes, or until the filling is piping hot and the surface is bubbling.
05 - After baking, stir the mixture and spoon it evenly over the base of each sandwich bun.
06 - Sprinkle with the reserved bacon and add pickles, lettuce, or tomato if desired. Cap each with the top bun and serve while warm.