I claim the ornamental design for the bagel plate, as shown and described.
FIG. 1 is a top view of a bagel plate.
FIG. 2 is a bottom view of the bagel plate shown in FIG. 1.
FIG. 3 is a right side view of the bagel plate shown in FIG. 1 (the left side view being a mirror image of the right side view); and,
FIG. 4 is a front view of the bagel plate shown in FIG. 1 (the back being a mirror image of the front view).
The broken lines depict portions of the bagel plate forming no part of the claim. The dash-dot broken lines depict boundaries of the claimed design and form no part thereof.