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In a small bowl, whisk together flax with warm water. Set aside.
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In a large bowl, combine oat flour, tapioca starch, cocoa powder, baking powder, and salt. Whisk together to remove any clumps.
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In a medium, heatproof bowl, add the chocolate, coconut sugar, and coconut oil. Place the bowl over a saucepan of simmering water (double boiler method) and stir occasionally until fully melted.
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Turn off the heat, stir in the flax mixture, non-dairy milk, pumpkin puree, and vanilla extract.
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Add the wet mixture into the dry mixture. Use a spatula to fold together the ingredients, make sure not to leave any patches of the dry mixture!
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Pour the batter into the 9x9 square pan and smooth flat.