Someone asked for as 1/2 sheet cake half vinilla & half choc. how is that done ?

Bake them separately then cut in half and put on board together with icing. You can either make them one layer or two layer cakes. If two layer, then after you cut them put one on top of other with icing in between and then do the same for other flavor. Hope this helps and I didn't confuse you.

Mix both flavor batters. You can either get a helper and pour each batter simultaneously into the prepared pan OR you can raise one side of the pan a bit on a folded towel, pour one batter in, then pour the other. The flavors will meet in the middle but generally don't mix together. I have had people just LOVE getting a slice of the cake where the flavors meet in the middle. HTH.

I put both batters in the pan at the same time. I either pour both at the same time or I put a piece of folded up foil in the middle to stop the batters, then pull it out before baking.

Sounds great! both methods I'm sure I'll be a basket case when the time comes.. Thanks !