I enjoy a good cupcake. Of course, my favorite are homemade, but I don't like to keep two dozen little temptations around my house. The best alternative is hitting a bakery like Billy's to satisfy your hunger for buttercream topped sugary cake delicious nuggets, otherwise known as cupcakes.
Billy's is one of the several Magnolia/Buttercup spinoffs in and around Manhattan. The reason I like the cupcakes from here is that they last more than just one day. Buy on Monday, eat on Tuesday OR Wednesday and you will still enjoy the cake (you will be on a bit of a sugar buzz too).
You can even hit it after 10pm on a Saturday night and join the masses...