Cookies also contain flour and butter, but quite a few other ingredients like eggs and sugar make the dough denser. Cookies are sweet and tend to come with extra treats baked in, such as chocolate chips and nuts. Biscuits, on the other hand, are a simpler recipe and are usually savory. The dough is lighter, fluffier, and more bread-like when compared to cookies. Of course, these definitions apply to the words as Americans use them – don't expect your biscuits to come with gravy in the UK!