Susan, I know this isn't a sweet treat but for dinner one night this week I made the WW Cauliflower Au Gratin. It was very good, even DH liked it. It does use a small amount of butter and parm, but you could leave that out without any dramatic changes in flavor.
I've also pinned a recipe for raw vegan brownies Raw Vegan Coconut Brownies - Food Doodles
that looks interesting. Will be trying these soon I think.