I went to UCLA for undergrad and grad school, so I've been in and around Westwood for a long time. Diddy Riese is a great place that we were introduced to at freshman orientation. The cookies are delicious when they've cooled, but are heavenly when warm! If you're feeling especially decadent, get the cookie sandwich filled with Dreyer's ice cream for only $1! The prices are cheap, but not the quality of the cookies. Even usc students come out to Westwood just for a bite of these tasty treats.