Preheat oven to 375°F (190°C) and lightly grease a 9x13 inch baking dish.

Arrange the chicken breasts in a single layer in the prepared baking dish.

In a medium mixing bowl, combine softened cream cheese, cream of chicken soup, chicken broth, ranch seasoning, garlic powder, and black pepper until the mixture is uniform.

Pour the sauce evenly over the chicken breasts, ensuring they are completely covered.

Bake in the preheated oven for 25 to 30 minutes, or until the chicken reaching an internal temperature of 165°F (74°C).

Sprinkle shredded cheddar cheese over the top and bake for an additional 5 minutes until the cheese is melted and bubbly.

Garnish with sliced green onions and allow to rest for 5 minutes before serving.