I made Peppermint Chocolate Pinwheels yesterday and they also have a strange aftertaste. I would describe as almost plasticky. I made these with a friend at her house and I am pretty sure the flour was pretty old since she had a bunch of it she bought at Costco and it was stored in a big plastic storage container - not a food container. And she had a bay leaf in it to repel weevils. The recipe included Peppermint extract and chopped Andes candy and the peppermint flavor seems to maybe exacerbate the after taste. I did not notice anything strange about the flour while I was mixing it, but everything else was fresh. I quadrupled the recipe so we would each have 2 batches, 12 dozen, for a cookie swap, and now I am bummed because they don't taste very good after all that work and money. After reading this, I am thinking the flour is likely the culprit.
Welcome to the forum @AOK!
Sorry to hear about the cookies, I would agree that the flour is the likely culprit. I've never heard of keeping a bayleaf in flour before, they can add quite a strong flavour to food so no wonder there was a weird taste!
You might have just got an old batch of flour before. Thats happened to me.
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