Thanks MarciK for the suggestion! No not too late, date is Saturday night and I will be baking Saturday. Actually I had thought of that but this is more a nibble than a real dessert.
For the moment, I am thinking cake, leave it in the mold and unmold at his place, possibly do frosting at his place (can't do the actual cake there, his baking equipment is ... substandard :)
As for cakes, I was thinking this [Chocolate and pistachio surprise cake] is quite original and I could make it bundt shaped with a simple melted chocolate pour on top?
I like this [Happy wife happy life chocolate cake], but think too complicated to carry and frosting too complicated as well.
Knowing that he likes when I bake things with "surprises" inside (like I baked the Mini banana cupcakes with a Nutella swirl but I didn't have enough Nutella, so some had nutella, some not, and he kept eating more just to find out which one it was :) - I was thinking maybe do a similar recipe with different flavours of jams inside, instead of nutella, but 1/ I don't really want to do the exact same recipe and 2/ no way I will have ripe enough bananas for Saturday.
Things like muffins will work I think if they have no frosting, or a very simple frosting that I could quickly do there (or just like pouring maple syrup on top)