01 - 
                Preheat the oven to 375°F (190°C). Prepare a casserole dish by spraying it with non-stick cooking spray, and set aside.
              
              
              
                02 - 
                In a large skillet, cook the ground beef and chopped onion over medium-high heat until browned. Drain any excess grease.
              
              
              
                03 - 
                Add the uncooked rice to the skillet and stir to combine with the meat and onions.
              
              
              
                04 - 
                Stir in the beef broth, sliced mushrooms, cream of mushroom soup, and sour cream. Mix well to combine. Add half the shredded cheddar cheese and stir again.
              
              
              
                05 - 
                Pour the mixture into the prepared casserole dish, spreading it evenly.
              
              
              
                06 - 
                Cover the casserole dish tightly with aluminum foil and bake in the preheated oven for 50 minutes, or until the rice is cooked and the liquid is absorbed.
              
              
              
                07 - 
                Remove the foil, sprinkle the remaining shredded cheddar cheese over the top, and return the casserole to the oven for an additional 5 minutes, or until the cheese is melted and bubbly.
              
              
              
                08 - 
                Once the casserole is cooked, remove it from the oven and let it rest lightly covered with aluminum foil for 5 minutes. Garnish with chopped fresh parsley before serving.