Preheat oven to 375°F. Lightly grease a 9x13-inch baking dish with cooking spray and set aside.
Unroll crescent dough and separate into 8 triangles. Place a spoonful of cooked chicken and a sprinkle of cheese at the wide end of each triangle.
Roll up each crescent starting at the wide end and rolling toward the point, enclosing the filling. Pinch any openings to seal.
Arrange rolled crescents seam side down in prepared baking dish, spacing slightly apart.
In a medium bowl, whisk together cream of chicken soup, milk, garlic powder, onion powder, and black pepper until smooth.
Pour sauce evenly over and around the crescent rolls, being careful to pour between rolls rather than directly on top.
Sprinkle remaining shredded cheese over the top of everything.
Bake for 25-30 minutes, or until crescents are golden brown and sauce is bubbling around the edges.
Let cool for 5 minutes before serving so sauce thickens slightly. Garnish with fresh parsley if desired.