Preheat your oven to 350°F (175°C). Lightly coat a 9x13-inch baking dish with nonstick spray or a thin layer of oil.
Separate the biscuit dough and slice each round into four equal portions. Set these biscuit quarters aside.
In a large mixing bowl, thoroughly combine the condensed cream of chicken soup, sour cream, milk, garlic powder, onion powder, salt, pepper, and the grated cheddar until the mixture is smooth and homogeneous.
Gently fold in the shredded chicken and the cut biscuit dough, making sure each piece is well-coated with the creamy mixture.
Pour the entire mixture into the greased baking dish, spreading it out evenly. If desired, sprinkle a handful of extra cheddar cheese over the top.
Place the dish uncovered in the preheated oven and bake for 25 to 30 minutes, or until the biscuit pieces are puffed and golden on top, and the center is hot and bubbly.
Allow the casserole to rest for 5 to 10 minutes before serving. Sprinkle with freshly chopped parsley for a colorful finish, if using.