Jenny's broccoli & cauliflower casserole

1 16oz. bag of frozen broccoli
1 16 oz. bag of frozen cauliflower
8 oz. Cheese Whiz
1 can of cream of mushroom soup
1 can of cream of celery soup
1 small can of French’s French Fried Onions

Steam veggies until tender. Mix soups & cheese whiz in casserole dish (I usually do this while the veggies are steaming). Mix veggies into mixture very well. Cook on 350 for 30-35 min. (you’ll have to bake a little longer if using a smaller casserole dish because it’ll be thicker). Add French Fried Onion to top & bake for 5 minutes more (or until brown).