1 stick butter
1 sm. onion, chopped
1 pkg. chopped broccoli, thawed
1 can cream of mushroom soup
1 (8 oz.) jar Cheez Whiz
2-3 c. cooked rice (start with 2 c. - adjust to consistency you desire)
1 sm. can sliced mushrooms

Melt butter in skillet. Add onions and stir well. Cook for 1 minute. Add broccoli, soup and Cheez Whiz, heating and mixing well. Add rice and mushrooms. Pour into 1 1/2 quart casserole. Bake at 350 degrees for 30-45 minutes.