Got this amazing recipe from dear old mom,not sure where she got it so I'm claiming it!! I am not a green bean casserole fan, but this is soooo good. The mushroom cooking in cream is something I am going to turn into a separate recipe sometime, it's soooo yummy. This is a staple on our Thanksgiving table, give it a try, you'll get rave reviews!! "All the components of this dish can be cooked ahead of time. The assembled casserole needs only 15 minutes in a 375-degree oven to warm through and brown. A gratin dish works nicely with this recipe."