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How to make microwave fudge 
Grease a baking pan. 
Coat an 8-inch (20-cm) baking pan with a layer of butter, oil, or cooking spray. This will prevent the fudge from sticking to the pan, and make it easier to remove once the fudge has set.
Alternatively, you can also line the dish with parchment paper instead. Heat the sugar, milk, and butter.