Thanks! Its my first time doing a sheet cake.
If I ever have had a cake that is undercooked, I do one of 2 things; -
I put the cake back in the oven for a few more minutes
If I already turned my oven off, I put the cake back into it, close the door & left the cake in the oven - seemed to finish cooking the small center part that was undercooked
Tip for next time: try placing a couple inverted, prepared, metal flower nails even spaced in the pan and then pour in your batter. They act as a heating core and will conduct the heat in the center of those really large sheet cake pans.
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