Egg Free Cookies to Decorate

I have a Christmas cookie making date with my goddaughter and her egg-free little brother next week. Does anyone have a reliable, delicious cookie that would work for decorating? It doesn’t necessarily have to be a roll out. I think they’d be happy to do balls that we roll in various sprinkles and sugars, too.

I appreciate any recommendations you have!

There are some good ideas in this thread.