The ornamental design for an electric baking pan, as shown and described.
FIG. 1 is a perspective view an electric baking pan showing the design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevational view thereof
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a right side view thereof.
The broken lines in FIG. 3 and FIG. 6 and lower opacity area within the broken lines show portions of the electric baking pan that form no part of the claimed design.