If you like, you can pour all the batter into a lined rectangular 9 x 13 inch baking pan and make a sheet cake instead of a layer cake. Make the same amount of ganache and spread it all over the top and sides in one thick layer. Mmm! The cooking temperature will be the same (160C or 320F) but the cooking time might be slightly different depending on the type of pan. Check at 20 minutes and every 5 minutes after to see if it's done.