I need a chocolate cake mix recipe to bake in a pyrex bowl!?

hi im desperately seeking advice from any keen cake bakers.. i want to make a cake for my daughters birthday.. a barbie doll.. with a dress (dress made of cake) ive seen lots of pyrex bowls being used as very easy to get great shape for the dress part.. but i am at a loss as to what recipe to use in the bowl how long to cook for what temp etc?!! please help me!!! thanks xxx