What size cake do you usually do for a smash cake for a 1st bday?
I normally do just a 6 inch one to match larger one
I also do a 6' cake
I do a single layer 6" as well.
A single layer 5 or 6 inch cake or a jumbo cupcake.
I used a 4" double layer iced in buttercream and it was just the right size for those little fingers and not too much mess to clean up! The little one still needed a bath afterward, but the clean-up was minimal.
(I like the idea of a jumbo cupcake too.)
I like to use a 4" or about that size. Usually they're carved so the size is approximate.