make a sheet cake 1/2 chocolate and 1/2 vanilla? Duh! 
I always make up both flavors, then have dh help me pour. We both start pouring on opposite sides, and they meet in the middle. You can also fold a piece of parchment several times and stand it up in the middle, then pour, and take out the parchment before you bake.
I would take the easy way out and do two 9x13's one chocolate one vanilla!
Ditto! That's what I always do- I make one 9x13 white and the other choc. And for an added feature, I put fresh starwberries between the layers and call it my "Neopolitan" cake. It's an awesome combination.
So you layer it? Sorry, I'm feeling dumb today. How do you do your strawberries?
I make up both flavors and then pour in the pan at the same time. I used to make two cakes until I read a thread about pouring both in one pan.
I have stiff plastic cutting boards that I cut to exactly fit the inside width of the pan I need to divide in half. I stand the plastic up on the bottom of the cake pan and pour my vanilla mix on one side and the chocolate on the other side. Then you simply pull the plastic board out and you have a perfect 1/2 and 1/2 cake.
The chocolate and the white are both done at the same time.
The plastic cutting boards come in packages of three in most stores and they are really inexpensive so it is no big deal to cut them up for this use. Works great and is so easy.
I have a plastic insert that clamps in the pan. It lets me pour in one batter at a time. Then remove the insert before baking.
I have also covered a rectangular piece of cardboard with foil and put that in the center of the pan as the divider, poured in the batter and then removed the cardboard divider. It worked just as well! HTH!
Thanks all. I'll let you know how it turns out!
Thanks for the tips guys, i have to try this real soon!!!!
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