Just saw this thread.....
Don't know why it's called "Texas Sheet Cake"...but the first time I had it was over 30 years ago in Omaha....made by the Wicked Witch of the West --- or in more polite terms---my ex mother in law. (God bless her....she probably hasn't made it out of Purgatory yet ....she's only been there a little over a year....

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It's a very fudgy chocolate cake, made with Hershey's cocoa powder, baked in a sheet pan...11x15...which is a cookie sheet with sides on it.
The cake only bakes about 15-20 minutes (haven't made it in years).
While it bakes, an incredibly chocolate frosting is made...lots of butter, sugar and Hershey's cocoa powder and chopped pecans.
As soon as the cake comes out of the oven, the frosting is poured onto the hot cake. The frosting hardens quite quickly to the consistency of fudge - tastes like it too. The frosting is almost as thick as the cake.
It is a chocolate lover's dream cake when served warm with vanilla ice cream on it......
