Heat a large nonstick pan over medium-high. Add the oil and fry the onion and garlic for about 2 minutes until golden. Meanwhile, place the milk, flour, mustard and seasonings in a small bowl and mix well.
Add the mixture to the pan followed by the sweetcorn; mix and stir well until the mixture comes to a boil and thickens. Stir frequently to keep the mixture from burning.
Divide into four bowls and top each with some grated cheese.
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