01 - Set oven temperature to 350°F (180°C) and allow to fully preheat.
02 - In a large mixing bowl, blend shredded chicken, softened cream cheese, cheddar cheese, ranch seasoning mix, and milk until evenly incorporated.
03 - Fold in half of the crumbled bacon, reserving the remainder for garnish.
04 - Transfer chicken mixture into a baking dish and bake uncovered for 20 to 25 minutes, or until heated through and bubbling.
05 - Stir the baked chicken mixture, then divide evenly among the lower halves of the sandwich buns.
06 - Sprinkle with reserved bacon. Add pickles, lettuce, or tomato if desired, and close with top buns. Serve immediately while warm.