The ornamental design for a cuttingboard with legs, as shown and described.
FIG. 1 is a perspective view of a cutting board with legs showing my new design.
FIG. 2 is a top plan view thereof.
FIG. 3 is a bottom plan view thereof.
FIG. 4 is a front view thereof.
FIG. 5 is a rear view thereof.
FIG. 6 is a right side view thereof; and,
FIG. 7 is a left side view thereof.
The broken lines showing the legs of the cutting board are unclaimed subject matter and form no part of the claimed design. The break lines represent uncertain lengths and portions between the break lines form no part of the claimed design.