The night before, mix together flour, active sourdough starter, 1/2 cup pumpkin and maple syrup. Cover and allow to ferment for at least 8 hours, or up to 24 hours. The next day, add to the cake mixture the salt, eggs, vanilla, and sucanat and baking soda and mix.
Spread evenly on a 10 by 15 inch sheet pan lined with parchment paper. Bake at 375 degrees for 15 mins. Roll it in the parchment paper as soon as it comes out of the oven. Allow the cake to cool while rolled.
Carefully unroll the cooled cake, spread on the cream cheese filling evenly, and roll it back up. Slice and serve or place in the fridge until you are ready to serve.
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