I'm needing to make a Onsie Cake for a Baby Shower.I'm not that sure of how to do it. I was just going to use a Full Sheet Cake and then cut it to look like a Onsie.Does anyone else have any suggestions?
I would do as you said and make a template from stiff card to cut around.
I haven't made one,but I'm pretty sure you're right that it is carved from a sheet cake. I think there is a template in here, check the gallery....
If you're going to carve it use a firm cake recipe or add an extender to the mix. Its a simple shape so you should do well.
To make cutting easier, refrigerate it first.