Whenever I'm in Vegas, I make it a point to have breakfast every day at Bouchon bakery. It's far superior to the Wynn cafe and unsurprisingly, cheaper too!
Don't bother with the drip coffee or espresso drinks here; it's like drinking water. I'm also not a fan of their madeleines--they were flavorless and foamy. But everything else I've had? Phenomenal!
Try the croissants (especially the STRAWBERRY ones), Parisian macarons (coffee, vanilla, and pistachio are my favs), their muffins, the red velvet cupcake, their focaccia, and the PB&J brioche. The eponymous bouchons are just okay, but are definitely satisfying if all you want is to fulfill a chocolate-y craving.