The ornamental design for a cookware handle, as shown and described.
FIG. 1 is a perspective view of the cookware handle, showing my new design;
FIG. 2 is a right-side view thereof; the left-side view being a mirror image thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a front view thereof; and,
FIG. 6 is a rear view thereof.
The dashed broken lines in the drawings show portions of the cookware handle and environment that form no part of the claimed design. The dash dot broken lines form a boundary that form no part thereof.