Cook, stirring often, for around 5 minutes, or until all of the ingredients are smoothly melted together. Remove from the heat.
Pour the fudge mixture into a 6x6-inch dish, or an 8x8-inch dish for thinner pieces, ideally lined with parchment paper. Then cover and store in the fridge for 3 hours, or until firmly set.
Once the fudge has set, you can simply slice and serve.