Preheat your oven to 360°F (180°C).
Wash the fresh green beans and trim the ends. You can choose to leave them whole or cut them into bite-sized pieces, depending on your preference.
In a large pot, bring water to a boil on medium-high heat and add a teaspoon of salt. Blanch the green beans for about 4-5 minutes until they become bright green.
Immediately transfer them to an ice bath to stop the cooking process. Drain and set aside.
In a mixing bowl, combine the condensed mushroom soup, milk, soy sauce, 100g fried onions, black pepper, and salt. Mix these ingredients until well combined.
Add the blanched green beans to the bowl and give them a good stir, ensuring the green beans are well coated with the sauce
Place the green beans in a baking dish or casserole, sprinkle the remaining fried onions evenly over the top of the beans, and then scatter the grated cheese on top of the fried onions.
Place the casserole in the preheated oven, and bake for approximately 25-30 minutes or until the casserole is bubbly and the top is golden brown.
Once done, remove the casserole from the oven and allow it to cool slightly before serving.