I pride myself on knowing where to get the best cakes, sandwiches, breads, chips, etc, in the Peaks. Tearooms are my area of expertise. Rosie's is a fab little tearoom in the lovely Hayfield village and does THE best brownies around. And so it should as it is run by an American lady and her husband. I found this cute little video, about Rosies, whilst searching for their website.
There was also the added bonus of this cutie, below, waiting outside for her owner to finish their tea and cake.