01 - Preheat oven to 400°F. Lightly grease a 9x13-inch baking dish with cooking spray or butter.
02 - Arrange the chicken breasts in a single layer in the prepared baking dish. Season both sides evenly with salt and black pepper.
03 - In a medium mixing bowl, combine the softened cream cheese, sour cream, and ranch seasoning mix. Blend with a spatula until completely smooth and homogeneous.
04 - Spread the cream cheese mixture evenly over each chicken breast, covering the entire surface to lock in moisture during baking.
05 - Sprinkle the shredded cheddar cheese uniformly over the coated chicken breasts.
06 - Bake uncovered for 25 to 30 minutes, until the chicken registers an internal temperature of 165°F on a meat thermometer and the cheese is melted and bubbly with golden edges.
07 - Remove from the oven and immediately top with the crumbled bacon and sliced green onions. Allow the dish to rest for 5 minutes before serving to let the juices redistribute.