When you're preparing food, keep the allergens far away from the allergen-free ingredients. If they get mixed up, your allergen-free dish is toast. Don't use the same cutting board for fish that you do for chicken, if you have a fish- allergic guest. Also, don't think fish is a great ingredient for a school bake sale or a 6-year-old birthday party. That's a mistake you'll only make once.
Additionally, don't let all this hard work keeping surfaces bleached and ingredients separate go to waste by serving up all of your safe food on a platter alongside the dangerous food. Continue to keep these foods separate, using separate cooking pots, pans, and sheets, as well as separate utensils. Consciously uncouple the allergy-laden from the allergy-free foods to make sure that the end result is safe for all.
More: The 5 Step Anti-Allergy Plan
Whew! That's a lot, but if you remember to keep your allergy-safe treats safe from the first time you pick up the ingredients until they are safely delivered to the sale, you'll make a heck of a lot of kiddos happy, as well as their very anxious parents. It's like farm to table, but without the hipster element.
If you want to get started baking right away, here are a few items to consider stocking in your pantry before you put on your allergen-free apron. (Okay, that's not a real thing, so don't panic. Any old apron without clumps of food on it will do.)