preheat your oven to 350°F (175°C).Mix the mushroom soup, milk, soy sauce, green beans, and half of the onions in a 1.5-quart casserole dish.Bake for 25 minutes until the mixture is hot and bubbly.Stir the casserole, sprinkle the remaining onions on top, and bake for 5 more minutes until the onions are golden brown.