In a saute pan over medium high heat, add oil, onion and garlic. Cook for 3 minutes then add rice. Toast for 3 minutes more. Transfer to 13x9 baking dish. Add chicken broth, mushrooms, and chicken.
Preheat oven to 400degF.
In a saucepan over medium heat, add butter, onion powder, and garlic powder. Once melted, whisk in flour and let cook for 3 minutes. Whisk in chicken broth and paprika and cook for 3 minutes. Stir in heavy cream and cheese. Cook another 3 minutes. Then add to baking dish. Stir to thoroughly combine.
Cover baking dish with foil and place in over to bake for 30 minutes.
Remove foil from baking dish and sprinkle with remaining cup of cheese and parsley. Bake for another 15 minutes. Let stand for 5 minutes before serving.