The ornamental design for a microwavemugcookerdevice, as shown and described.
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FIG. 1 is a perspective view of a mug cooker showing our new design;
FIG. 2 is a perspective view of a mug cooker in a two-member open configuration;
FIG. 3 is a perspective view of a bottom member of the mug cooker;
FIG. 4 is a perspective view of a top member of the mug cooker;
FIG. 5 is a front perspective view of a mug cooker;