Check your quest list and tap on the little picture of „events“ quests.
I bet you have to cook the recipe in the kitchen.
(That’s guessing from the non-information in your post that you just started the event.)
Help could be much more specific if you stated in which location you are/have last been.
You can check the quests here
The first number 5 tells you to bake, that has to be done in the kitchen of your camp.
If you don’t see the recipe, check your filter settings for event recipes also.