I have offered to make dessert for my nephew's birthday party, which will be a BBQ held at a local park. I am hesitant to make cake, cupcakes, or anything with buttercream that will be difficult to transport and likely to melt and get messy. I am looking for something easy, transportable, but more fun and festive than plain old brownies. Any ideas? There will be about 20-25 people, mostly adults but some kids of all ages. Thanks!