Preheat oven to 350 degrees F (175 degrees C).
Bring a large pot of salted water to a boil.Add potatoes and cook until tender, about 15 minutes. Drain and place in a 2 quart casserole dish.
In a microwave safe dish combine cheese, butter and milk.Microwave until cheese and butter melt; stir in the sherry.Pour cheese mixture over potatoes and sprinkle cornflakes crumbs on top.
Bake in preheated oven for 15 to30 minutes, or until heated through.
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