Broccoli-Cauliflower Casserole

1 pound frozen broccoli
1 pound frozen cauliflower
1 can cream of mushroom soup
1 small jar Cheez Whiz®
1 small can French-fried onions

Place broccoli and cauliflower in a 9 x 13-inch baking dish on top of stove. Heat the soup and Cheez Whiz® in a pan. Pour over the vegetables. Bake for 40 minutes at 325 degrees F. Place the onions on the vegetables during the last 10 to 15 minutes.