Broccoli Casserole

I cook this for my church crowd. I leave out the onions when I cook it for them, because I have some people with "onion issues". You choose to add them or not; it works either way!

2 cups cooked white rice

5 tablespoons margarine
1 cup chopped onions
1 (10 ounce) package chopped frozen broccoli, thawed and drained
1 (10.75 ounce) can condensed cream of mushroom soup
8 oz Velveeta cheese, cubed

Preheat oven to 350 degrees F.
Melt margarine in a medium skillet over medium heat. Saute onions until tender. In a 2 quart casserole dish combine onions, cooked rice, broccoli, mushroom soup and cheese; mix well. 
Bake for 35 minutes.