1 (16 ounce) package frozen broccoli
1 (16 ounce) package frozen cauliflower
2 (4.5 ounce) jars button mushrooms, drained
1 can cream of mushroom soup
1 (8 ounce) jar process cheese spread
1 (2.8 ounce) can onion rings

Cook broccoli and cauliflower in microwave until almost done. Drain water and add mushrooms.

Stir together soup and cheese spread. Fold into vegetables. Top with onion rings. Bake at 350 degrees F for 20 to 30 minutes.