1 pkg. (10-12 oz.) frozen broccoli cuts
1 pkg. (10-12 oz.) frozen cauliflower
1 pkg. (10-12 oz.) frozen Brussel sprouts
1 can cream of mushroom soup
1 (8 oz.) jar Cheez Whiz
1 (4 oz.) can fried onions

Cook vegetables separately and drain. Grease 2 quart casserole with butter. Heat Cheez Whiz and soup together until cheez is melted. Layer each vegetable in casserole and between each layer spread 1/3 of soup and cheez mix. Bake at 350 degrees for 25 minutes, then remove and top with fried onions. Put back in oven for 5 more minutes.