Has anyone ever tried to inject (with a syringe) filling for a mini cake or cupcake too I suppose? I was just wondering if it would work. Think of a Twinkie

I suppose it would be the same as filling a cupcake. I have a, I think it is a "bismark" filing tip that I use. It is the long skinny tip. I don't know the number for it.

I've done it before. Just poke a round frosting tip into a part of the cake that will be covered with frosting (so the hole is hidden) and squeeze your frosting bag until it feels like the frosting's not going anywhere. Just make sure your cakes are cool before you start.

I have done this before. Wilton has the filling injectors (that is what I used). You need to hold the cupcake in your hand and inject it before you frost it. If you hold it, you will feel when it is "full." I bought premade bavarian cream filling from the Amish store in my town, but there are plenty of recipes. Hope this helps!
Andria

I fill mine all the time with chocolate ganache, so its kinda like a cupcake truffle.

I just bought a syringe (flavor injector for like a turkey) from Walmart its like $2. I fill it up with the chocolate ganache, and shoot it right in there. The kids LOVE them!