I chose Canelés because they are the only ones that are not filled with cream.

SAME!!!

I chose princess cake because I had no idea what the correct answer was and just picked it randomly 🤣

I thought the same thing

Neither do I. Just eggs and good dark chocolate.

You put ice team in it though?

My chocolate mousse has eggs, chocolate and whipped cream. I've never come across a recipe that includes butter. However, a bit of googling reveals a number of recipes do use it.