01 - Set oven to 350°F (180°C) to preheat while preparing other components.
02 - In a large mixing bowl, thoroughly combine shredded chicken, softened cream cheese, cheddar cheese, ranch seasoning, and milk until the mixture is creamy and homogenous.
03 - Fold in half of the crumbled bacon, reserving the remaining bacon for topping.
04 - Transfer the mixture to a baking dish and bake uncovered for 20 to 25 minutes until hot and bubbly.
05 - Stir the baked filling, then generously portion onto the bottom halves of each sandwich bun.
06 - Top with remaining bacon, add pickles, lettuce, and tomato if desired, then cover with top buns and serve while warm.