Chop Green beans to 1 inch and Boil until tender, about 4 min. Drain and set aside
In a large skillet over medium heat, melt your butter and add your chopped mushrooms and minced garlic. Let simmer for 5-7 min
Add the flour to your mushroom mixture and stir until evenly incorporated. Allow to cook for 2 minutes.
Add your chicken stock and whisk for 2 minutes. Your sauce will begin to thicken
Reduce your heat to low and add our heavy cream. Whisk until completley incorporated
Add your Worcestershire sauce, salt, and pepper. Mix together.
Add your green beans and mix unil evenly coated.
Transfer to a baking dish and cover the top with the french-fried onions
bake your casserole at 375°F for 25-30 min
Notes
-Keep an eye on the crispy onions as this is baking to make sure they do not burn. If they start getting darker than a golden brown then cover the casserole for the remainder of the cooking time-Dont be shy with your green beans, If you want to add extra go ahead!