Preheat the oven to 350°F and lightly spray a 1 1/2-quart casserole dish with nonstick cooking spray. Cook the rice according to package directions.
Combine cooked rice, cream of chicken, corn, and butter; mix well.
Pour into the prepared casserole dish. Bake for 20 to 30 minutes or until bubbly. Remove from oven, top with cheese, and return to oven until cheese is melted.