This isn't exactly an energy bar, but really a snack bar, and is free from major allergens - no wheat, dairy, egg, soy, peanuts, tree nuts, fish, shellfish. Also made without casein, potato, sesame and sulfites, and made in a dedicated nut- and gluten-free bakery.
http://www.enjoylifefoods.com/our_foods/snack_bars.html
I found them at my local regular grocery store. There are other products and some recipes on the website also. I'm just glad there's something quick to grab that I don't have to cook!