I claim the ornamental design for a cookie cutter, as shown and described.
FIG. 1 is a plan view of a cookie cutter in accordance with my design, a
handle for the cookie cutter being shown in phantom forming no part of my
design;
FIG. 2 is a side elevation view the cookie cutter shown in FIG. 1, the
opposite side being identical;
FIG. 3 is a top view of the cookie cutter shown in FIG. 1; and,
FIG. 4 is a bottom view of the cookie cutter shown in FIG. 1.