Grab the largest microwaveable bowl in the kitchen and add the condensed milk, butter and sugars. No need to mix just ensure that the container is LARGE because the contents are going to bubble up furiously and splattered fudge mix is way not cool to clean off.
For a 900W microwave, cook the mixture on full power for 9 minutes, removing the bowl for stirring every 3 minutes. If your microwave has a lower wattage you'll need to cook the mixture for longer. Add 1 minute of cooking time for every 50W less power.
Once the cooking time has finished, add in the vanilla extract and Baileys and beat the mixture until it begins to look smooth and glossy.
Transfer the fudge mixture into a 9" square tin to cool. You can be smart and line the tin with greaseproof paper to prevent sticking or just hook it out crumbled bits and all like I do. Once the mixture has cooled to room temperature, you can pop it in the fridge for a firmer set if required.
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