Volcano cake. Chocolate bunt cake (I used a rose pan), with chocolate glaze as the base. I plugged the hole in the top with a marshmallow. To make the erupting lava I put wood skewers on waxed paper and filled a baggie with melted red candy melts, snipped the corner off and piped it over the skewers. The rest of the red I drizzled over the sides to make lava flows and made a big blob of it over the marshmallow. Right before the party, I stuck the skewers in the cake.