your oven may run hot....i would either try with reducing the heat and/or making sure you rotate the pan and move it around in the oven every so often. all ovens have hot spots.
Is it the silicone one? I bake both sections together on a cookie sheet at 325 for about 30 minutes. I don't remember exactly how long, but the bottom takes a lot longer than the top. I just keep checking for doneness every 5 minutes or so past 20 mins. Mine come out perfect golden on the outside. I also spray the mold with cooking oil. HTH
Re: help with giant cupcake
what problem are you having?