If you hanker for a Mounds Bar, or Peppermint Bark, never fear.
You can make them at home. Here are a few resources for making your own chocolates at home (and not on equipment used to manufacture products with peanuts, tree nuts, or any of the other top 8 allergens or otherwise).
Peanut Butter Cups (substitute Sunbutter for Peanut Butter).
I haven't made any of these, mind you, but it's nice to see the resources online. Can you tell I'm craving chocolate and candy today?!?
And a side note: If you want to recreate some restaurant recipes, check out this site. You have to pay for the recipes (all I believe - but they are only .79 each), but if you really want to recreate something at home (and allergen-free), this looks like the place to start!