I have not tried this recipe, but I have made the not non-GF choc chip cookie recipe from vegan diner and it is fantastic. Julie posted a GF version on her blog.http://www.juliehasson.com/2012/09/glut ... ipcookies/
or how about an apple crumb topped pie or apple cobbler? i really don't know a lot about GF but are oats GF? maybe you could make a sweet, crumbly topping using oats, butter, sugar, spices??