Here's a list that Confessions of a Slacker Mom pulled together.
I typically focus on Peanuts (duh! That's what my kid is allergic to), but her list is free of the Top 8 allergens - soy, dairy, wheat, egg, peanut, tree nut, shell fish, fish.
If you are just avoiding peanuts, most Hershey plain chocolate (kisses or mini milk chocolate bars) are safe too. As are Oreos and Marshmallows if you want to make Oreo Pops or Marshmallow Pops ;)