Charlotte Lafauci's Broccoli and Rice

2 cups cooked rice
1 cup chopped celery
1 cup chopped onions
2 T butter
1 pkg chopped broccoli, boiled until slightly tender
1 can cream of chicken soup
1-5oz jar Cheese Whiz

saute celery and onions, add soup and Cheese Whiz, Heat until smooth, add cooked broccoli and rice.  Put in 2 quart baking dish.  Bake at 350 degrees for 30 minutes.  you can double this recipe for a large crowd.  It's better if it sits in the refrigerator overnight.  Do NOT freeze.