To a medium sized saucepan, add the beer and bring to a simmer over a moderate heat.
Once the beer is simmering, add the cream cheese block and whisk until it is well combined with the beer. Continue to whisk until the mixture begins to bubble slightly.
Now add the shredded cheeses and continue to whisk until all of the cheese is melted and the dip is smooth.
Add a pinch of cayenne or some black pepper if you would like to.
Pour into a serving dish and allow to cool slightly so it begins to thicken.