Do you have an old-time favorite recipe that you loved for years then stuck it in the recipe box and forgot about it? This Peanut Butter Sandwich Cookies recipe is one of those favorite recipes that was hidden away. 26 years ago, Matt and I went on our honeymoon to a cottage in Berlin, Ohio. They had a tray of these peanut butter flavor cookies with creamy peanut butter filling as we walked in and were gracious to give us the recipe. They are a double dose of peanut butter!