Macaron, a French pastry. This sandwich-like pastry made with two thin cookies and a cream between them exists in a wide variety of flavors. This actual piece is a Pierre Hermé's “Olive Oil and Vanilla” macaron.
<a href="//commons.wikimedia.org/wiki/User:Myrabella" title="User:Myrabella">Myrabella</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>