DO IT! I haven't done it with Kit Kats, but I did chop up some Reese's Cups and add them to a filling before. My friend and his family LOVED it.
I actually think Kit Kats are good because you can cut them into nice square chunks so they don't fall apart. The wafers may get soft but it will still be awesome! Let me know how it turns out!
Thats all I did was chop it up and then mix it into some buttercream. I have never added syrup to it. So I have no insight on that. But just adding it to the buttercream was really good. I have ate my share of filling each time I made one of these! LOL
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