If using a standard blender, put the miso if using and 2 cups of corn with a small amount of the liquid in the blender and let cool for at least 5 minutes before blending. Stir occasionally to release steam. Put the blender lid on and hold it down with a kitchen towel while blending. Alternatively, place a towel over the lid before blending, blend for just a couple seconds, then remove the lid to release some of the steam. Repeat one or two more times if there is still a lot of steam. Then, continue to blend until smooth and pour the creamy mixture back into the soup pot.