Spatulatta.com Green Bean Casserole You will need: 1 bag of frozen French style green beans 1 can French fried onions 1 can of Campbell's Cream of Mushroom soup 1/8 teaspoon of pepper 3/4 cup of milk A casserole dish Rinse green beans in hot water until defrosted then let drain. Mix the milk, pepper and soup together in a bowl. Put a layer of sauce on the bottom of the casserole dish. Then a layer of green beans.  Repeat until all the sauce and beans are in the casserole. Put the French fried onions on top. Bake at 350 for 35 minutes.