pour batter at the same time into pan it will make a straight enough line. HTH
I bake them both in the same pan, pouring the batter from both sides and letting them meet in the middle. There is a special divider that you can get for cake pans that you pour the batter in both sides and then take the divider out, but I don't see it as something anyone needs to buy. 
Deanna
I have one of those flimsy plastic cutting mats I use just for these kinds of cakes. I bought mine at the dollar store and just cut it to make it easier to hold while pouring. I just pour one side while holding the mat, then pour the other side. I do find that my chocolate cakes rise more than my white but it's no big deal I just trim it.
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