Preheat oven to 350°F.
Spray a 9x13 inch baking dish with nonstick spray. Spread the uncooked rice evenly into the prepared pan, then sprinkle with 1 cup of shredded cheese.
Cut the chicken breasts in half lengthwise and season with salt & pepper.
Add them to the baking dish with the rice and cheese, then spoon the condensed cream of chicken soup evenly over the top.
Add the chicken broth and milk, then sprinkle with the onion soup mix.
Bake, covered, at 350° for 1 hour 30 minutes or until rice is completely cooked.
Remove the pan from the oven, stir gently to combine the rice and sauce, and sprinkle the remaining 1 cup of cheese over the top. Return the pan to the oven for 5-10 minutes or until cheese is melted.
Let stand for 10 minutes; garnish with fresh parsley before serving. Sprinkle with salt & pepper to taste.