Preheat the Oven: Set your oven to 350°F (175°C).
Mix the Sauce: In a mixing bowl, combine the cream of mushroom soup, milk, soy sauce, and pepper.
Combine Beans & Sauce: Stir in green beans and 2/3 cup of crispy fried onions.
Transfer to Baking Dish: Pour the mixture into a 9x9-inch or 1.5-quart baking dish.
Bake: Bake uncovered for 25 minutes until bubbly.
Add Topping: Sprinkle the remaining crispy onions over the top.
Final Bake: Return to oven and bake for 5 more minutes, or until onions are golden.
Serve: Let cool for a few minutes and serve warm.