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1
Heat the oven to 175 °C. In a 1.5-litre baking dish, stir together the condensed soup, milk, and soy sauce until fully combined — the sauce should be an even, pale tan with no streaks of unmixed soup.
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2
Fold in the drained green beans and half the fried onions. Stir until every bean is coated. This is the step on which the dish lives or dies: if the beans carry excess moisture the sauce will break and pool; they must be thoroughly drained before they enter the dish.
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3
Bake uncovered for 25 minutes, until the sauce is bubbling steadily at the edges of the dish.
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4
Scatter the remaining fried onions evenly over the surface and return to the oven for 5 minutes, until the topping is golden and audibly crisp when tapped with a spoon.