01 - Set oven to 350°F (180°C) and allow to fully preheat before assembly.
02 - In a large mixing bowl, combine shredded chicken, cream cheese, cheddar cheese, ranch seasoning mix, and milk. Mix thoroughly until evenly combined.
03 - Gently fold in half of the crumbled bacon to distribute flavor throughout the mixture.
04 - Transfer the chicken mixture to a baking dish. Bake uncovered for 20 to 25 minutes, or until the mixture is bubbling and heated through.
05 - Stir the baked chicken mixture briefly, then spoon a generous portion onto the bottom half of each sandwich bun.
06 - Top sandwiches with the reserved bacon. Add pickles, lettuce, or tomato if desired. Cap with the top buns and serve immediately while warm.