Preheat the oven to 350°F.
In a large mixing bowl, combine the drained green beans, cream of mushroom soup, milk, soy sauce, garlic powder, onion powder, and half of the French fried onions. Season with salt and pepper to taste and mix well.
Transfer the mixture to a greased 9x13-inch baking dish. If using, sprinkle the shredded cheddar cheese evenly over the top.
Bake in the preheated oven for 25 minutes. Remove from the oven and stir the casserole. Top with the remaining French fried onions.
Return to the oven and bake for an additional 10-15 minutes, or until the casserole is bubbly and the onions are golden brown.
Let the casserole cool for a few minutes before serving.