I don't have a wondermold pan and have never made a barbie cake, but I have baked a cake in a bowl before. I think that's the route I'd go, just like you said. I would make sure that the barbie or barbie pick has clearance by stacking the bowl and/or pans you would be using 
Yep! I hadn't thought of the stainless steel bowls either until Cake Central. I had used my Pyrex and then read something and was like "DUH" 
Why didn't I think of that? I put in the rose nail upside down in the bottom and sprayed the whole thing w/ Baker's Joy and fill it about half way up. Then I bake at 300 degrees and just check it first time after 25 min. and then every ten minutes for the next three checks (depends on the size of the bowl). Then after that if it needs more baking time I check every 5-7 minutes. 
Thanks. I think I will be doing that. I just wish I knew the servings for the bowls. I was thinking of using the 4 qt. mixing bowl. Wasn't sure how long it would take to bake. I wonder how many it would feed? My daughter's 4th birthday party is this Sat. and she wanted Barbie. My husband's sister's b-day is the day before my dh and his best friend's b-day is 9/11, which is the same as my dh, so I'm making a 2nd cake for their combined birthday like this.
http://www.marthastewart.com/portal/site/mslo/menuitem.fc77a0dbc44dd1611e3bf410b5900aa0/?vgnextoid=faee90df14463110VgnVCM1000003d370a0aRCRD&vgnextfmt=default
Thanks for your help.
Ooooh that cake looks good (the strawberry shortcake one?)
I also just thought of one more tip for servings. You could fill the bowl half way w/ water and measure it to see how many cups of batter you will need. 6 cups of batter is kind of like a 1/4 sheet of cake or like 24 cupcakes. HTH
yeah, the strawberry shortcake one. I'm not using that recipe though. I'm making an almond sour cream cake recipe, and the filling between the layers will be a cream cheese and strawberry mixture. Good idea. I think I'm going to bake them tomorrow and pop them in the freezer. When you have to cook for almost 50 people on top of the cakes, the sooner I start the better.
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