The ornamental design for a cookingsplatterdevice, as shown and described.
FIG. 1 is a top front perspective view of the cooking splatter device of my present invention.
FIG. 2 is a rear bottom perspective view thereof.
FIG. 3 is a right side elevation view thereof.
FIG. 4 is a left side elevation view thereof.
FIG. 5 is a front elevation view thereof.
FIG. 6 is a rear elevation view thereof.
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
Portions not illustrated herein form no part of the claimed design. The surface shading lines are included to illustrate contour only and form no part of the present design.