Melt the butter in a medium saucepan over medium heat. Add the flour and whisk it together until a thick paste has formed, about 1 minute. Pour in the beer and continuously whisk so there are no lumps. Cook the mixture to allow the alcohol to cook out from the sauce, 2 to 4 minutes. Add the whole milk, Worcestershire, mustard, garlic powder, paprika, salt and pepper and whisk until everything is fully incorporated. Remove the pan from the heat and add the cheese in batches, making sure all of the cheese has fully melted. |