I would epoxy that up, WasatchMan. You can fix it for about $10-15. A two part epoxy from home depot or lowes, a couple of small c-clamps (you can find them for like $2-3) and a couple pieces of thin scrap wood or metal.
Let the board sit in a dry, room temperature environment (in your house, preferably). If you can dry it at a LOW temperature with a heatgun or hairdryer after letting it sit for at least 24 hours, that's even better.
Mix the two part up really well and us a popsicle stick or something similar to apply it between the topsheet and the core. Clamp it down, using the pieces of scrap wood or metal to act as pressure distribution plates. Let it cure for at least 24 hours. Also, before you let it set, if any epoxy squeezes out, wipe it up, you'll be saving yourself work later.
Come back 24-48 hours later and sand/file down all excess that squeezed out. You're done.