Get a casserole dish and start by putting in 1/2 of the broccoli. Next add the stick of butter. Then add all the rice and onions and on top of that put in the other 1/2 of broccoli and 1 cup of water. Top it all off with all of the Cheez Whiz.
Pop it in the oven. Let cook for 20 minutes at 400 degrees F and then back down the oven to 325 degrees F and let bake for another 30 - 40 minutes.