Thumbprint Cookies are a timeless cookie and this mix makes whipping up a batch something that happens in no time at all! The name 'thumbprint' comes from the fact that you use your "thumb" to make an indentation into each ball of shortbread-like dough. The indentation is then filled with your favorite jam, preserve, or conserve; of which, we recommend the Imladris Farm Berry Best Jam. This is one cookie that quickly becomes a family activity. For best results, chill the dough before baking.