How To Cut Cookie Squares The following pictures are here to provide a visual guide in How To Cut Cookie Squares. Click on an image to enlarge it and read its caption. Once completely cooled, cut the 9 x 13 inch cookie into 32 even pieces. This may be done in the pan. Alternatively, the entire non-cut baked good can be removed from the pan and cut on a cutting board Start by making eight guide marks in the 9 x 13 inch cookie using a paring knife – one at the middle of each 9 inch end and three each equally spaced along the 13 inch sides Align a large knife with the guide cuts and make three straight cuts across the cookie. Make two more 13 inch cuts and four 9 inch cuts to produce 32 cookies.