Preheat oven to 325 degrees. Mix all the ingredients except for the chocolate in a mixing bowl. Mix until everything is combined. Add the chocolate and mix again to incorporate.
Put the mixture into an ungreased 9-inch square pan. Pat down the mixture evenly.
Bake them for about 30 minutes or until they are brown on the edges. Remove the pan from the oven. While still hot from the oven, cut the shortbread into desired sizes. Let cool completely in pan. Makes about 16 pieces.