When I did my doll cake in the pampered chef bowl - I beleive I used the whole cake mix - or filled it 3/4 of the way - the biggest problem is baking in the middle - I remember it taking a long time. I would call your local pampered chef consultant and see what they have to say as they are the ones promoting that you can bake a cake in them!
Good luck!! (I have found instead of cupcakes the little prep bowls being GREAT for giving you a perfect little ball if you have those!!)
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