To make these sourdough vegan pancakes fluffy and avoid gummy pancakes there are three key things that you need to be avoided. * Do not use high protein flour, they make gummy pancakes. * Avoid overmixing the batter. Overmixing leads to gluten development, which can make the pancakes gummy and chewy. * Ensure the baking powder is active and do not let the batter rest for long. Start making the pancakes immediately as you make the batter.