This is officially the best cake I've ever had. I was planning on making it for Saint Patrick's Day since it has that theme with the beer and Irish cream and all...but I never had time. Sooo I decided to make it as my birthday cake instead! I did only make one layer of this cake since there's only three people in my family and I wouldn't have wanted the cake to dry out if we didn't eat it in time. If you choose to make one layer, then just half the recipe below. But I recommend making the full amount because the cake lasts for a long time (I had the last slice today and it was the 3rd day, and it still tasted incredible) and you will definitely have no problem eating it all in a short period of time once you have your first slice. I don't know about you guys, but I'm a huge sucker for alcoholic beverages in desserts. I know...my parents aren't very happy about that...but I can't control my taste buds! This cake is the absolute best chocolate cake/birthday cake/Saint Patricks Day cake I've ever tasted! I think it's even better than my Best Chocolate Cake recipe (found here), which kind of defeats the title..but that recipe is still the best classic chocolate cake I've ever had. However, this recipe is a little more jazzed up with the beer in the cake, the Bailey's buttercream frosting, and the chocolate ganache. The chocolate cake layer itself is moist, rich, and perfectly dark chocolatey. But the frosting and ganache is what really sets this cake from a 10 on a 1 to 10 scale to 100. The Irish cream liquor gives this frosting an incredibly unique, sweet, and rich taste that I had never tasted before but instantly fell in love with. If you are a big frosting fan, then I would recommend doubling it...it's very delicious to eat it by the spoonful as well(: And then you have this incredibly chocolatey and rich deep chocolate ganache drizzled on top that makes the cake so beautiful and perfect. I'm going to be making this for many holidays and birthdays to come in the future.