Add Yahoo as a preferred source to see more of our stories on Google. Hand flattening peanut butter cookie dough with fork - Carey Jaman/Shutterstock It's pretty easy to identify the peanut butter ...

When it comes to classic cookies, peanut butter cookies topped with a crisscross pattern are as nostalgic as it gets. But is that pattern just for looks, or does it serve another purpose? The answer ...