I picked up chestnut flour at the farmer's market a few weeks ago, originally for a chestnut pear cake recipe. I've been trying to use the rest in a brownie recipe. The first attempt was a great texture, but I accidentally reached for peppermint instead of vanilla and so you couldn't taste anything but mint. In these, I used all chestnut flour, which gave it a great flavor, but the brownies dried out really quickly. I have enough flour for one more attempt, but I may just go back to the pear cake. That one I know works!