Season the chicken thighs with salt and pepper then set aside.
In a seperate bowl, add the rice, cream of chicken soup, milk, water, and onion soup mix. Stir to combine.
Pour the rice mixture into a greased 9x13 baking pan. Distribute the rice mixture evenly, then sprinkle half of the shredded cheddar cheese.
Nestle the seasoned chicken thighs into the rice, then cover tightly with foil.
Bake at 350° for 1 hr and a half
Once the casserole is ready, remove from the over, remove the foil, and add the rest of the shredded cheese over top. Stir the rice and add some dried parsley on top for garnish.