Add the ingredients to a blender. Place the dried shiitakes and salt into the bowl of a high-speed blender.
Blend. Blend for 30-40 seconds or until you get a very fine powder. Be aware that the mushroom powder is very fine and light, a bit like powdered sugar. So, after blending, I highly recommend waiting for a couple of minutes before opening the blender lid for the powder to settle a bit.
Transfer to a container. Finally, transfer the mushroom seasoning to a clean glass container or jar.
Use in broth, soups, marinades, or dips to add an umami flavor!
