Mixing Bowl Cover

FIG. 1 is a perspective view of a mixing bowl cover showing my new design; FIG. 2 is another perspective view thereof; FIG. 3 is a front elevational view thereof; FIG. 4 is a rear elevational view thereof; FIG. 5 is a left side elevational view thereof; FIG. 6 is a right side elevational view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; and, FIG. 9 is an exploded perspective view thereof. The broken lines in the drawings depict portions of the mixing bowl cover and form no part of the claimed design.