What does 餅乾 mean in Taiwan? I'm unfamiliar with the variety of Mandarin spoken in Taiwan, so I was surprised to see a chilli-snack 香脆椒 referred to as 餅乾:

http://mall.tw100years.com/goods.php?id=9
真不敢相信這真是美味的餅乾！看起來是紅紅的辣椒，吃起來是香、脆外加點淡淡的鹹，不但能幫您排去宿便，還能養顏美容！

The definition of 餅乾 that I'm familiar with is biscuit or cracker, a baked pastry food. This snack doesn't fit that definition; it is made of fried chilli peppers:
I am Taiwanese, and I have even had this "餅乾" once.

Generally, we can refer to almost every snack that is made with flour and "cracks" in your mouth as 餅乾. So when you say you want some 餅乾, people will not only give you crackers, but also cookies, potato chips, wafer cookies, wafer rolls, mille feuille, etc. These things have their own specific names, of course!

Even these are 餅乾: Jagabee Fries, and Pocky.

I would also like to clarify that this sentence is not in Taiwanese. It is in Standard Chinese, but we have our own accent and wording. Just like the differences between American English and British English. We normally speak two languages in everyday life, i.e. Chinese and Taiwanese, a Min dialect.