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Preheat oven to 250C (480F). Generously butter bread and place on a baking tray lined with foil or baking paper.
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Bake for 3 minutes or until butter is melted.
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Combine cheese, mustard and may. Completely cover the bread with the cheese mixture.
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Bake for another 5 minutes or until the cheese is melted and bubbling with golden brown patches.