Begin by preheating your oven to 350 degrees Fahrenheit. Lightly grease a 9x13 inch baking pan and set it aside for later use.
In a mixing bowl, combine the rice, onion, soup, chicken, vegetables, and cream until well mixed. Transfer the mixture into the greased pan.
Bake the casserole for 20 minutes initially. Then, sprinkle cheese evenly over the top and continue baking for an additional 5-10 minutes, or until the cheese is melted and bubbly.
Once done, remove the casserole from the oven and serve it hot.
Notes
To store casserole cover and refrigerate in the refrigerator. Casserole will stay fresh for several days.