The ornamental design for an eggcooker, as shown and described.
FIG. 1 is a front view of an egg cooker of the present invention.
FIG. 2 is a back view thereof.
FIG. 3 is a left view thereof.
FIG. 4 is a right view thereof.
FIG. 5 is a top view thereof.
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a perspective view thereof.
The broken line showing of certain portions of the egg cooker is included for the purpose of illustration only and forms no part of the claimed design.