Hi, I'm 47, and I've been deathly allergic to peanuts since I was an infant. I started out baking cookies when I was seven or eight and have since progressed to scratch puff-pastry, baklava, and other wonderful things:). I use King Arthur flour, Callebaut bulk chocolate, organic bulk cocoa, grocery store butter, grocery store sugar, and just about anything else -- as long as you cleaned between whatever it is you last made and the peanut allergy person's baked goods, I don't see the problem. I use walnuts, pecans, almonds, and hazelnuts all the time -- it's the peanuts that make my throat itch from 10 feet away -- and even if someone ate it the night before, I can still smell it on their breath at lunchtime the day after. But honestly, your normal thorough washdown should be good:).