This little kiosk exists right at the entrance to the Phantom theater. They offer paninis and muffins and other assorted treats, but the reason to stop is the macaroons. There are several flavors including chocolate, raspberry, and pistachio. If you buy five you get the sixth free, and you can pick your own flavors you do not have to get the pre-made sampler packs.
The coffee brewed here is drinkable, so if you need an energy boost the have ice cold Red Bull, and even champagne splits which go quite nicely together. Only in Vegas can you enjoy a classic French macaroon while sipping champagne and Red Bull and not be the oddest character in sight.