If using fresh green beans, blanch them by boiling for 5 minutes, then draining. If using frozen, thaw and drain.
Prepare the casserole mixture:
In a large mixing bowl, combine the cream of mushroom soup, milk, salt, pepper, and soy sauce (if using). Stir in the cooked green beans and half of the fried onions.
Assemble the casserole:
Pour the mixture into a 9x13-inch baking dish. If you like extra flavor, sprinkle the cheddar cheese on top.
Bake:
Bake the casserole for 25-30 minutes, until bubbling.
Add fried onions and finish baking:
Remove from the oven, sprinkle the remaining fried onions on top, and bake for an additional 5 minutes until golden brown.
Serve:
Let cool slightly before serving.
Notes
This Green Bean Casserole is a creamy and crispy holiday classic, perfect for Thanksgiving or any family gathering!