In a pot combine uncooked rice, water, and chicken bouillon. Cook according to package directions, about 20 minutes at a simmer covered.
Meanwhile, in a mixing bowl combine frozen veggies, chicken, and shredded cheese. Set aside.
In a small bowl or measuring cup combine milk, condensed cream of chicken soup, gravy mix, salt, pepper, and onion powder.
Pour the milk gravy mixture into the bowl of chicken, frozen veggies, and shredded cheese.
Once the rice is done, pour it hot right into the bowl of chicken and veggies and mix it all together.
Preheat the oven to 350 ℉ and prepare a 9x13 inch baking dish with baking spray.
Spread the mixture into the baking dish. Sprinkle 1 to 1.5 cups of shredded cheese on top of the chicken rice casserole.
Bake for 30 minutes until bubbly and heated through. Serve hot. Enjoy!