To make green bean casserole for boy scouts I used 8 cans of green beans and 4 cans of cream of mushroom soup. I then mixed in some milk, soy sauce, and crunchy onions. I’ve started to not measure so much, but I try to use the basic instructions used for the smaller servings and estimate about how much. I then bake it at 375 for a little while. After it’s been in the oven for a while – about 45 minutes, I add some crunchy onions around the top for looks and bake another 5 minutes.
It’s serves several people and makes a large amount to take for an event.