After verifying that power was being supplied to the Twinkie, we concluded that the resistivity of the Twinkie must be so high that not enough current was passing through to cause any noticeable change. Therefore, we broke the Twinkie into smaller pieces. Small bubbles seemed to appear in the top of the filling. After these small changes, nothing else happened. Thus we have no observations for the control or subject Twinkies after the electricity was shut off, and cannot compare them to make any conclusions.
Science can be frustrating.
This was a very boring experiment, but it got us a lot of weird looks from people passing by. We noted that Twinkies pass almost no current, probably because they are almost totally sugar. This, above all other tests, shows the Twinkie to be a truly multipurpose material. If you want to electrically isolate a room from static or higher voltage electricity, you can simply line it with Twinkies.