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Add cream of mushroom soup, milk, soy sauce, green beans, and 1 cup fried onions directly to casserole dish. Stir ingredients together until thoroughly incorporated, then spread mixture out into one even layer covering entire bottom surface of casserole dish.
Cover dish tightly with lid, aluminum foil, or food-safe plastic wrap. Place covered dish in refrigerator up to 3 days ahead of cooking.
When ready to cook casserole, preheat oven to 350° Fahrenheit. Remove casserole dish from refrigerator, uncover, and place dish directly in preheated oven. Bake 35 minutes.
Remove casserole dish from oven. Top casserole evenly with remaining ⅓ cup fried onions, then return casserole dish to oven and bake 5 minutes or until onion topping has browned.
Remove casserole from oven. Let stand 5 minutes, then serve as desired.