I claim the ornamental design for a cookware device, substantially as shown and described.
FIG. 1 is a top perspective view of the cookware device showing my new design;
FIG. 2 is a front elevation view thereof; the rear view being mirror image;
FIG. 3 is a side elevation view thereof; the opposite side view being mirror image;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a bottom, perspective thereof.
A cookware device, the broken lines showing portions of the design in the figures are included for the purpose of illustrating environment and unclaimed features and forms not part of the claimed design.