why not try crinkle cookies… they are very simple. choc. chip squares go very well too. there’s also yummy and easy to make rugelach recipes (I think the lubavitch cookbook has an easy recipe). Cutting up vegies and fruit is ALWAYS a help for a vort and maybe making a nice dip. You could always make a truffle of some sort with vegies or mousse and choc. cake. If you want something really simple buy pretzels and melt choc. (maybe get a good recipe of what to add in to the choc) and dip the ends in choc and sprinkles!
Mazel Tov! Let us know what you make in the end