The temperature in your oven may be off. Get an oven thermometer so that you can adjust for the temperature difference.I'm cooking at that but the outside is burning before the inside is cooked, I think it needs to be lower in the oven, or on an ven lower temp, but I can never work that out.
My mother can, but then she learnt to cook on a wood fire oven.
Like one of these:
http://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias=aps&field-keywords=oven+thermometer