How to make Green Bean Casserole Christmas Side Dish

How to make Green Beans Casserole (Thanksgiving Side Dish)baked in a White Sauce, with Mushrooms, Water Chestnuts, Onion, & Cheese. Make the day before, ready for the oven on Thanksgiving Day. Your first bite makes you want for more. All my side dishes are scrumptious, tested & tweaked. I know it sounds like a brag, but they are all delicious.
Saute:
2 Tbl Butter
8 oz Can Sliced Water Chestnut 16 oz French Style Green Beans
1 Cup Mushrooms 1/2 Cup Cheddar Cheese
Sm Onions 1 Cup French Fried Onions
Saute:
4 Tbls Butter
1/4 Cup Flour
1 Cup Milk
1/2 cup Chicken Broth
1/2 Tsp Soy Sauce