Frankly, I don't really understand the December cookie craze. If you ask me what my favorite Christmas cookie is, I'll tell you chocolate chip. Only chocolate chip. At least, that would have been my firm answer right up until last week when I discovered Regan Daley's butter-toffee crunch shortbread and had a change of heart. It was love at first bite, and it took everything in me not to hide in the pantry and devour the whole pan.