I have a cake question!

First of all please accept my apologies in advance for a potentially obvious and stupid question.

Is there a particular name given to cakes that look like this?

https://www.instagram.com/p/Bbcl1Zbn3M_/?taken-by=ottolenghi

My assumption is that they are simple sponge cakes baked in a muffin tin and turned upside-down before icing. But my cake knowledge is lacking and I'm worried there is something more complex going on.

Anyone care to enlighten me please?