I need a few dessert recipes that will hold up to the warm summer heat. I have my daughter's graduation party in a few weeks at a local park. We are having cake, of course, but I need to make some finger-type desserts that can sit out in the sun and not spoil or get mushy or anything. I am planning on brownies since I know they will hold up. I need something I can prepare either a day or two ahead of time. I am doing all the cooking by myself so I need fast and simple! Also, keep in mind--I'm feeding mostly high school/college kids. We know how fussy they can be!